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fix #631 on the control of the resolution-dependent fast algorithm and clean-up

Yin Zhao requested to merge Yin/VVCSoftware_VTM:FixCleanup_P0983 into master

With fix in #631, SBT is always tested in RDO, as "((cu->lwidth() > 32 || cu->lheight() > 32) && !(m_pcEncCfg->getUse64SBTRDOCheck()))" is always false.

Actually, it should be skipped for CU with one side > 32 when the picture resolution is below HD, as described by the resolution-dependent fast algorithm in JVET-P0983 method 1.

To make the command line name more accurate, it was changed from "SBT64RDO" to "SBTFast64".

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