Remove testing strings
Update model to Ussuri 1.4.0

-Upgrade test.controller_test to meet new intializer standards
-Revert test.main to just run a suite
-Update the roadmap for the engine
-Add ussuri.graphics, move misc.color to graphics.color
-Convert to ISO 639-1 language codes
-Optimize specific statements (content.localization particularly)
-Add stub 'start' method to ussuri.core
-Reinstate utility::do_nothing()
-Add 'self' to parameters in functions used in the data.bindable object
-Rename 'update' event to 'tick' in all cases to prevent ambiguity
-Finish conversions from key.unicode to key.code in keydown events
-Add global positional event arguments 'ox' and 'oy' to UI elements.
These replace the draw event's 'tx' and 'ty' and are added to mouse
events as well, simplifying some code.
-Remove mouse 'lx' and 'ly' event parameters, these are the same as 'x'
and 'y' -- for absolute mouse positions, now use 'abs_x' and 'abs_y'
which have existed forever.