Split animation.d into many files
Split atlas.d into many files
Split attachment.d into many files
Split bone.d
Added attachment.d
Added atlas.d
Split skeleton.d
Split skin.d
Split slot.d
Split util.d
Updated all.d
Shortened argnull.d
Added alias Vector Size for vector.d
Fixed util.init.d

Now it is shorter and it works
Merge branch 'modules-split'

Conflicts:
	src/spine/atlas.d
	src/spine/slot/slot.d