Added more convenience functions to SATVector
Added new module: Light

This module will perform 2d dynamic lighting calculations using SAT
objects.
Added sample/test class for Light module
Started using LightSample. Updated SATSample.

Updated SATSample to match LightSample's structure.
Possible TODO: Create a parent sample class to manage samples/testing.
Renamed project to ue2d.

( Unnamed Engine 2D )