Make project exclude git files
Rename core::fileget to core::load
Fix string concatenation issues in debug core
Rename box to rectangle_shape
Add ui.circle and circle_shape
Add utility.table::contains
Update utility.functor for easier identification of functables
Add oop::mix and remove static objects
Remove richtextlabel stub class
Remove classes made obsolete by oop::mix
Fix UI class generics
Increment built version file
Update the todo with new progressions
Demonstrate new oop::mix ability in engine test
Add z-ordering of UI elements
Make the inner loop of oop::mix more clear