Cppcheck integration

[dafeda]

Adding cppcheck in separate PR because it fails.

cppcheck --enable=style,portability,performance,warning \
           --library=posix \
           --inline-suppr \
           --project=compile_commands.json \
           --error-exitcode=1 \
           --suppressions-list=../cppcheck/suppressions.txt \
           --verbose \
           --template="{file}:{line} [{severity}] {message}" \
           2>&1
  shell: /usr/bin/bash -e {0}
  env:
    pythonLocation: /opt/hostedtoolcache/Python/[3](https://github.com/dafeda/si4ti/actions/runs/12964180604/job/36162594015#step:9:3).11.11/x64
    PKG_CONFIG_PATH: /opt/hostedtoolcache/Python/3.11.11/x6[4](https://github.com/dafeda/si4ti/actions/runs/12964180604/job/36162594015#step:9:4)/lib/pkgconfig
    Python_ROOT_DIR: /opt/hostedtoolcache/Python/3.11.11/x64
    Python2_ROOT_DIR: /opt/hostedtoolcache/Python/3.11.11/x64
    Python3_ROOT_DIR: /opt/hostedtoolcache/Python/3.11.11/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.11.11/x64/lib
Checking /home/runner/work/si4ti/si4ti/timeshift/src/timeshift.cpp ...
Defines:NDEBUG=1
Undefines:
Includes:
Platform:native
Checking /home/runner/work/si4ti/si4ti/timeshift/src/timeshift.cpp: NDEBUG=1...
/home/runner/work/si4ti/si4ti/timeshift/src/timeshift.cpp:0 [information] Limiting analysis of branches. Use --check-level=exhaustive to analyze all branches.
Warning: ner/work/si4ti/si4ti/timeshift/src/timeshift.hpp:632 [warning] Member variable 'Si4tiPreconditioner::vintages' is not initialized in the constructor. Member variables of native types, pointers, or references are left uninitialized when the class is instantiated. That may cause bugs or undefined behavior.
Warning: ner/work/si4ti/si4ti/timeshift/src/timeshift.hpp:632 [warning] Member variable 'Si4tiPreconditioner::diagonals' is not initialized in the constructor. Member variables of native types, pointers, or references are left uninitialized when the class is instantiated. That may cause bugs or undefined behavior.
Warning: ner/work/si4ti/si4ti/timeshift/src/timeshift.hpp:632 [warning] Member variable 'Si4tiPreconditioner::traces' is not initialized in the constructor. Member variables of native types, pointers, or references are left uninitialized when the class is instantiated. That may cause bugs or undefined behavior.
Warning: ner/work/si4ti/si4ti/timeshift/src/timeshift.hpp:632 [warning] Member variable 'Si4tiPreconditioner::dims' is not initialized in the constructor. Member variables of native types, pointers, or references are left uninitialized when the class is instantiated. That may cause bugs or undefined behavior.
/home/runner/work/si4ti/si4ti/timeshift/src/timeshift.hpp:[5](https://github.com/dafeda/si4ti/actions/runs/12964180604/job/36162594015#step:9:5)67 [style] Redundant assignment of 'derived' to itself.
/home/runner/work/si4ti/si4ti/timeshift/src/timeshift.hpp:575 [style] Redundant assignment of 'trace' to itself.
1/7 files checked 14% done
Checking /home/runner/work/si4ti/si4ti/timeshift/src/apply_timeshift.cpp ...
Defines:NDEBUG=1
Undefines:
Includes:
Platform:native
Checking /home/runner/work/si4ti/si4ti/timeshift/src/apply_timeshift.cpp: NDEBUG=1...
/home/runner/work/si4ti/si4ti/timeshift/src/apply_timeshift.cpp:0 [information] Limiting analysis of branches. Use --check-level=exhaustive to analyze all branches.
2/7 files checked 28% done
Checking /home/runner/work/si4ti/si4ti/timeshift/test/testsuite.cpp ...
Defines:NDEBUG=1
Undefines:
Includes: -I/home/runner/work/si4ti/si4ti/timeshift/src/
Platform:native
Checking /home/runner/work/si4ti/si4ti/timeshift/test/testsuite.cpp: NDEBUG=1...
3/7 files checked 42% done
Checking /home/runner/work/si4ti/si4ti/timeshift/test/timeshift.cpp ...
Defines:NDEBUG=1
Undefines:
Includes: -I/home/runner/work/si4ti/si4ti/timeshift/src/
Platform:native
Checking /home/runner/work/si4ti/si4ti/timeshift/test/timeshift.cpp: NDEBUG=1...
/home/runner/work/si4ti/si4ti/timeshift/test/timeshift.cpp:0 [information] Limiting analysis of branches. Use --check-level=exhaustive to analyze all branches.
Warning: ner/work/si4ti/si4ti/timeshift/src/timeshift.hpp:[6](https://github.com/dafeda/si4ti/actions/runs/12964180604/job/36162594015#step:9:6)32 [warning] Member variable 'Si4tiPreconditioner < double >::vintages' is not initialized in the constructor. Member variables of native types, pointers, or references are left uninitialized when the class is instantiated. That may cause bugs or undefined behavior.
Warning: ner/work/si4ti/si4ti/timeshift/src/timeshift.hpp:632 [warning] Member variable 'Si4tiPreconditioner < double >::diagonals' is not initialized in the constructor. Member variables of native types, pointers, or references are left uninitialized when the class is instantiated. That may cause bugs or undefined behavior.
Warning: ner/work/si4ti/si4ti/timeshift/src/timeshift.hpp:632 [warning] Member variable 'Si4tiPreconditioner < double >::traces' is not initialized in the constructor. Member variables of native types, pointers, or references are left uninitialized when the class is instantiated. That may cause bugs or undefined behavior.
Warning: ner/work/si4ti/si4ti/timeshift/src/timeshift.hpp:632 [warning] Member variable 'Si4tiPreconditioner < double >::dims' is not initialized in the constructor. Member variables of native types, pointers, or references are left uninitialized when the class is instantiated. That may cause bugs or undefined behavior.
4/[7](https://github.com/dafeda/si4ti/actions/runs/12964180604/job/36162594015#step:9:7) files checked 57% done
Checking /home/runner/work/si4ti/si4ti/impedance/src/impedance.cpp ...
Defines:NDEBUG=1
Undefines:
Includes:
Platform:native
Checking /home/runner/work/si4ti/si4ti/impedance/src/impedance.cpp: NDEBUG=1...
/home/runner/work/si4ti/si4ti/impedance/src/impedance.cpp:0 [information] Limiting analysis of branches. Use --check-level=exhaustive to analyze all branches.
5/7 files checked 71% done
Checking /home/runner/work/si4ti/si4ti/impedance/test/testsuite.cpp ...
Defines:NDEBUG=1
Undefines:
Includes: -I/home/runner/work/si4ti/si4ti/impedance/src/
Platform:native
Checking /home/runner/work/si4ti/si4ti/impedance/test/testsuite.cpp: NDEBUG=1...
6/7 files checked [8](https://github.com/dafeda/si4ti/actions/runs/12964180604/job/36162594015#step:9:8)5% done
Checking /home/runner/work/si4ti/si4ti/impedance/test/impedance.cpp ...
Defines:NDEBUG=1
Undefines:
Includes: -I/home/runner/work/si4ti/si4ti/impedance/src/
Platform:native
Checking /home/runner/work/si4ti/si4ti/impedance/test/impedance.cpp: NDEBUG=1...
/home/runner/work/si4ti/si4ti/impedance/test/impedance.cpp:0 [information] Limiting analysis of branches. Use --check-level=exhaustive to analyze all branches.
7/7 files checked [10](https://github.com/dafeda/si4ti/actions/runs/12964180604/job/36162594015#step:9:10)0% done