Reduce MCTF peak memory allocation by computing applyMotion in place

Fabrice URBAN requested to merge furban/ECM:MCTF_mem_reduction into master

Reduce peak memory allocation in MCTF by computing applyMotion in place, right after motion estimation, instead of allocating a vector of PelStorage. Doesn't change the resuts. Peak used memory is not changed, but less memory is allocated Results are unchanged (bit accurate)

Edited by Fabrice URBAN

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