log: blockattack-game

The base for a build in Puzzle Editor.

It cannot be used to create a new file at the moment and it has no undo at all but the basic functionality is there.

Add developer name

code/gamecontroller.h: Fix header guard

I would prefer having the CI compile on a different version but Fedora is too unstable

* Add Open Age Rating
* Add releases

* Start using libfmt for internal formatting
* Update README with libfmt info
* Remove the SPrintCF that we do not need anymore

Garbage textures are now created to a new texture before being rendered to screen.
This prevents tearing when scaling the windows in software render (and possible other modes).

Start drawing rectangles to texture before rendering with screen. This prevents spaces while running software render while stretched.

* Add Github actions
* Also add lint
* Add Windows build
* Remove Travis

PNG is the preferred raster format in XDG icon themes, with XPM
supported only for backward compatibility. Hence, convert the
application icons for the XDG icon theme to PNG.

The XPM icons were converted to PNG using 'convert', part of
ImageMagick.