Added QtCreator stuff to .gitignore.
Updated Find modules for GLEW, Magnum and HarfBuzz from Magnum repository.
Adapted to Magnum changes.
Game: unbreak animations.

Redrawing only when animation is running was breaking them, as the
animation got too long time of previous frame (e.g. 2 seconds), causing
weird hiccups or the animation not running at all.
Fix Windows build.