Migrate spacerocks to new glhck && engineworks

Texture sizes are now correct in glhck, hence glhckSpriteNew sizes are multiplied by two.

No more alpha needs to be set for texture/material, glhck knows itself if alpha is needed (if it doesn't know for sure, alpha is preferred eg. atlases for now).

Text system uses now Stash instead of Draw, and Clear needs to be issued when text stashing ends.
GameNotification uses glhckTextPlane instead of it's own implementation. The text quality will get better later.