tpa functions  & fixed/renamed TMufasaBitmap.CreateTPA

tpa:
- added SortATPAFromFirstPointX
- added SortATPAFromFirstPointY
- added MedianTPA,
- added MedianTPAEx
- added FilterTPAsBetween

bitmaps
- fixed CreateTPA and renamed to FindColors (way more suitable name)
- exported FindColors to ps, (mufasabitmap type + function "FindColorsBitmap")

All tested in ps & lape, hate, delete, say anything you want. But i see a good use in every single func/proc :)