WINTERMUTE: Formatting
WINTERMUTE: Extend usage of transformStruct, some cleanup
WINTERMUTE: Fix ticket system to watch for new rect after transform + extend usage of TransformStruct

The ticket system used the "old" rect as a basis for comparison when
checking for duplicates of the present ticket, and thus did not find
anything and would do a lot of useless redraws.
Perhaps this can be improved by comparing the whole of the
transformStruct - perhaps add a comparison operator?
WINTERMUTE: Attempt to extend transformStruct to tickets
WINTERMUTE: Factor out interpolating code, add switching between nearest and interpolating
WINTERMUTE: Remove SDL_rotozoom.cpp