fix(API): sbpp_checker library name

[Rushaway]

Description

Fix library name conflict between sbpp_checker and sbpp_main (both were using sourcebans++)

• sbpp_main keeps sourcebans++
• sbpp_checker now uses sourcebanspp_checker

This allows proper verification of specific libraries via LibraryExists and avoids any confusion between the two plugins.

Description

The main issue is a library name conflict where both sbpp_checker and sbpp_main were using the same name "sourcebans++" when registering their library via RegPluginLibrary. This was causing problems when checking for library existence with LibraryExists.

Motivation and Context

• We are verifying for LibraryExists with sourcebans++ for using sbpp checker natives, wich was always incorrect to due the same RegPluginLibrary as sbpp_main.

How Has This Been Tested?

Tested with a test plugin implementing all new forwards:

• Verified forward calls with PrintToServer
• Tested plugin reload and pause scenarios
• All forwards triggered as expected

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.

[Rushaway]

cc @Hackmastr @rumblefrog @maxime1907

[rumblefrog]

Is this ready for review, or still draft?

[Rushaway]

Draft. I need to edit it later today.

[Rushaway]

@rumblefrog Ready to be merged with a squash commit.
This change can be a breaking change for others 3rd party plugins, but it worth it.