CenterTPA (Multimethod), More sorting, TPAExtract

Did also do some renames:
TPASeperateAxis -> TPASplitAxis
GetTPAMax -> TPAMax
GetTPABounds -> TPABounds
GetTPAExtremes -> TPAExtrmes
GetTPABBox -> TPABBox
GetTPAMean, GetTPAMiddle -> TPACenter
New method for TPACenter:
TCenterMethod = (CM_Bounds, CM_BBox, CM_Mean, CM_Median);