Fix shader loading on mac/linux
Use size_t for entity/component indexing
Add +/- buttons for adding/removing entities. Insert/delete keys not available on laptops...
Merge branch 'master' of https://github.com/OlaOst/OneHundred

Conflicts:
	source/components/input.d
	source/renderer.d
	source/systems/collisionhandler.d
	source/systems/graphics.d
Fix merge and osx issues