ae.sys.file: Fix openFile for modes other than "r"
ae.utils.alloc: Fix compilation with DMD master
[BREAKING] Overhaul of ae.utils.graphics
Fix compilation with DMD master
ae.utils.graphics.draw: Rename clear to fill

It was conflicting with object.clear.
ae.utils.graphics.image: Fix saving grayscale PNGs
ae.utils.graphics.image: 64-bit fixes