Remove unnecessary variable
Clean up remainind references to 'render thread'
Document 'WindowSizeNotify'
Rename 'resetInput' to 'resetInputStates'
Use C99 integer types instead of Qt's
Null PhysFS handle after closing
Add bounds check to setter
Beautify constant
Properly delete[] arrays
Properly destroy fade thread
Raise exception on invalid bitmap sizes

A difference to RMXP is that negative height values
will result in exceptions too.
Also change Bitmap constructors to not allocate Private
struct before potential exceptions.
Document nonstandard RGSS extensions