Shooting mode support (GIF, screen, video)

[deepnight]

[kLabz]

Do you have leads on that? Currently I'm only able to generate animated pngs (with a modified png writer in format lib, I should clean it up and open a PR), but support for reading those is limited.

[deepnight]

Well actually it's mostly about adding a few keyboard shortcuts to turn the game into "screenshot" / "video" shooting modes. Usually, in these modes, I increase color contrast, remove UIs etc.

It's not a GIF nor a video generator, as capture still has to be done externally :)