decodeMbAux UT addition
Merge pull request #658 from JuannyWang/mbaux

[Encoder UT] decodeMbAux UT addition
Refine ME cross search ASM UT.
Merge pull request #660 from zhilwang/refine-me-asm-ut

Refine ME cross search ASM UT.
    add memory allocation for screen content
Merge pull request #662 from ruil2/enc_update2

    add memory allocation for screen content