Reduce and refactor code for IntraTMP zones (lossless)

Gleb Verbarequested to merge
gverba/ECM:REFACTOR_INTRATMP_ZONES into master
  1. Remove code reduplication in xCalcTmpFlmRefArea() by call to clipMvIntraConstraint()
  2. Remove code reduplication in clipMvIntraConstraintRefine() by passing pre-clipped parameters from clipMvIntraConstraint()
  3. Extract picture boundary and search area clipping from X/Y-Min/Max expressions
  4. Small odd edits to support legacy code within the new code

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