Refactor of MV related code

Xiang Lirequested to merge
XiangLi/VVCSoftware_VTM:refactor_mv into master

Refactor of MV related code, bit-exact to VTM-5rc1 1, Constants for max bits of MV 2, MV precision, including better implementation for affine AMVR.

Edited by Xiang Li

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