Finished adding supported for deleting types in a CX_DataFrameCell.
Updates to documentation.
CX_Display::getCenterOfDisplay() renamed to getCenter().
Input devices changed over to using deques internally, which simplifies clear() and allows for the new copyEvents() functions for CX_Mouse, CX_Keyboard, and CX_Joystick.
Some internal details of CX_Logger updated to use better namespacing.
CX_DataFrameCell now has an explicit clear() function.