Also, rename the graphics 'Effect' class in order to avoid naming clashes (and/or coder
confusion) with the newly named ScriptingEffect class.
Lastly, add some documentation for the classes for further clarity.
This is the first part of the changes to make the engine use RGB555
internally again. This is done to simplify the rendering pipeline -
the engine will use RGB555 internally, but will output to RGB565.
The overall changes have been broken into two commits, thus this
first commit will break all the game colors
