JVET-W0134: Uniform metrics log without MS-SSIM

Franck Galpinrequested to merge
Franck/ECM:unified_logs into master

merged JVET_W0134_UNIFORM_METRICS_LOG (without MS-SSIM code) into ECM HEAD macro under JVET_W0134_UNIFORM_METRICS_LOG

Edited by Vadim Seregin

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