Reduce and refactor code for IntraTMP zones (lossless)
- Remove code reduplication in xCalcTmpFlmRefArea() by call to clipMvIntraConstraint()
- Remove code reduplication in clipMvIntraConstraintRefine() by passing pre-clipped parameters from clipMvIntraConstraint()
- Extract picture boundary and search area clipping from X/Y-Min/Max expressions
- Small odd edits to support legacy code within the new code