Release v1.0

Bump version to 1.0

Add some news to the web page, and fix the last modified date there. (It was
showing correctly online but using the wrong file.)

Release v0.9.27.1

GitHub release workflow: install wget on Windows

Release v0.9.27

Require chambercourt 0.9.21

Release v0.9.26

Bump chambercourt requirement to 0.9.20

Release v0.9.25.2

Change to match chambercourt

Release v0.9.25.1

Bump version to 0.9.25.1

Release v0.9.25

Bump version to 0.9.25 and chambercourt to 0.9.19

Release v0.9.24

Update level 12 'Stairway to Hell'

Release v0.9.23

Bump version to 0.9.22 and chambercourt to 0.9.16

Release v0.9.22

GitHub release workflow: install pyinstaller only where needed