Rewrite refmvs.c

Approximately 12.1% faster while using 27.7% less memory on first 1000 frames of Chimera 8bit/1080p on a Haswell system, single-threaded.

Fixes #217 (closed).

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• 3b0c60df - Use union refmvs_pair { mv mv[2]; uint64_t n; } for MV pairs

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added 80 commits

• 3b0c60df...fe52bffe - 78 commits from branch videolan:master
• 6943e7d0 - Rewrite refmvs.c
• fc228628 - Use union refmvs_pair { mv mv[2]; uint64_t n; } for MV pairs

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added 2 commits

• 351ba26b - Rewrite refmvs.c
• 0c43d055 - Use union refmvs_pair { mv mv[2]; uint64_t n; } for MV pairs

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added 2 commits

• 97eaeacb - Rewrite refmvs.c
• ea1a4257 - Use union refmvs_pair { mv mv[2]; uint64_t n; } for MV pairs

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mentioned in issue #165 (closed)

added 2 commits

• e2af88d4 - Rewrite refmvs.c
• 39250cf1 - Use union refmvs_pair { mv mv[2]; uint64_t n; } for MV pairs

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added 1 commit

• 7a44f1ea - Merge fix_mv{_int,}_precision() into get_gmv_2d()

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