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Fix the bug of incorrect context state recovery at Intra search

Gleb Verba requested to merge gverba/ECM:FIX_INTRA_DECISION_2 into master

States were not recovered properly for element SecondMpmIdx and for TMP and MIP estimation, therefore estimated costs got unpredictable bias. A lambda function is added to simplify the code.

This MR replaces !576 (closed)

Results:

All Intra Main 10
Over ECM-11 Y U V EncT DecT
Class A1 -0.01% -0.04% 0.06% 101.3% 101.4%
Class A2 0.00% -0.03% 0.08% 101.3% 102.1%
Class B 0.00% 0.12% 0.00% 101.4% 101.4%
Class C 0.01% -0.04% 0.04% 98.7% 98.3%
Class E 0.00% 0.11% 0.08% 100.0% 99.0%
Overall 0.00% 0.03% 0.05% 100.5% 100.4%
Class D -0.04% 0.05% 0.02% 101.3% 102.5%
Class F 0.02% -0.02% 0.08% 102.6% 100.7%
Class TGM 0.01% 0.01% 0.00% 101.6% 100.8%
Edited by Gleb Verba

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