* shader cache: Fix possible race causing crashes on manifest at startup
This fix a misplace function call ending up causing possibly two write
on the cache.info at the same time.
* shader cache: Make RemoveManifestEntries async too to be sure all operations are perform before starting the game
Here come Salieri, my implementation of a disk shader cache!
"I'm sure you know why I named it that."
"It doesn't really mean anything."
This implementation collects shaders at runtime and cache them to be later compiled when starting a game.