-added custom Array container with iterator support and a space effecient bool specializaton
-changed tabs from spaces to indents
-renamed src/Classes to src/Entities
-added support for building with ninja and added corresponding shell scripts
-added EntityView class to iterate over entities of the same tag
-entities are now grouped together in memory by tag rather than all together
-moved globals.h into utility.h
-moved EntityTag and EntityIndex into utility.h