RA CRF Improvements

Description

Optimizations and tuning for all presets, particularly in fast-decode level 2. Remove support for RMV (--rmv).

VP9 Decoder: WebM Project VP9 Decoder v1.14.1-359-gc6de95ce0

AV1 Decoder: LibDav1d V1.5.0

Issue

Author(s)

@PhoenixWorth @hguermaz @psao123

Performance impact

• quality
• memory
• speed
• 8 bit
• 10 bit
• N/A

Test set

• obj-1-fast can be found here
• other
• N/A

Merge method

• Allow the maintainer to squash and merge when PR is ready to create a 1-commit to the master branch. The maintainer will be able to fix typos / combine commit messages to create a more readable 1-commit message or use whatever is stated in the 'Description' section
• I will clean up my commits and the maintainer shall use 'rebase and merge' to the master branch