[WIP] Port the project to Godot 4

[qrrk]

I finally decided to bite the bullet and make a serious attempt to port Catapult to Godot 4. I already looked into it before and know that it will be a lot of work, but it will have to be done eventually. Some things will probably have to be seriously rewritten, especially the more hacky parts related to theming and windowing.

[qrrk]

If anyone is curious, this is how it looks so far, after a couple of evenings of fixing. It launches (barely, still with some errors), but many systems are completely broken.

[Ruteski]

wonderfull

[AriaMoradi]

wonderfull

@Ruteski please use github reactions. :+1:

[qrrk]

Must have

• [x] Fix any immediate blocking problems (script parsing errors, etc.).
• [ ] Verify core functionality and fix if needed:
  • [x] Game installation.
  • [x] Game launching.
  • [ ] Handling of multiple game installations.
  • [x] Mod installation and management.
  • [x] Soundpack installation/deletion.
  • [x] Font customization.
  • [x] Backups.
• [x] Fix localizations.
• [x] Fix tab disabling method in Tabs.gd (or find an alternative).
• [x] Fix stable/experimental selection UI.
• [x] Fix appearance of custom icon buttons.
• [x] Revisit OSExecWrapper and decide what to do with it.
• [ ] Fix invisible scroll bars.
• [ ] Fix visual issues in themes.
• [ ] Fix icon scaling.
• [ ] Fix font scaling.
• [ ] Fix any other issues with theme scaling.
• [ ] Playtest on Linux.

Nice to have

• [ ] Modernize code according to changes in Godot 4 (new getter/setter syntax, typed arrays, callables, etc.).
• [ ] Zipping and unzipping can now be done by Godot itself. There is no need to rely on external commands or exe's anymore.
• [ ] Use OS.create_process for game launching.

Extra ideas (can be done later)

• [ ] Centralize duplicated JSON loading code that exists in many places.
• [ ] Add a new theme based on Godot 4 editor theme.
• [ ] Create a watchdog for the game process that will track if the game is running.

[pierredavidbelanger]

While trying to work on #182 , I opened the project in Godot 4 (I was not aware this project was done in v3). Wow, this seems like a huge task. Ill take a look at your godot4 branch on some spare time and see if I can help.