libaom v3.10.0 release candidate 1

[Wan-Teh Chang]

Hi everyone,

libaom v3.10.0 release candidate 1 is available. The release tag is
v3.10.0-rc1. Your testing will be greatly appreciated.

This release includes new codec interfaces, compression efficiency and
perceptual improvements, speedup and memory optimizations and many bug
fixes. This release is ABI compatible with the last release.

The definitions of the internal macros AOM_INLINE and AOM_FORCE_INLINE
have been removed from the public header aom/aom_integer.h.

- New Features
* New codec controls:
* AV1E_SET_AUTO_TILES
* AV1E_GET_HIGH_MOTION_CONTENT_SCREEN_RTC
* AV1E_SET_POSTENCODE_DROP_RTC: Post encode frame drop feature.
* AV1E_SET_MAX_CONSEC_FRAME_DROP_MS_CBR
* New key-value pair for aom_codec_set_option():
* "auto-tiles": equivalent to the new codec control
AV1E_SET_AUTO_TILES.

- Deprecated Features
* Deprecated codec control:
* AV1E_SET_MAX_CONSEC_FRAME_DROP_CBR: Use the new codec control
AV1E_SET_MAX_CONSEC_FRAME_DROP_MS_CBR instead.
* The sframe_mode field in the aom_codec_enc_cfg_t struct is not
implemented.

- Compression Efficiency Improvements
* BD-rate gain of 0.7 - 1.3% (by enabling global motion tool) for
speed 5 and speed 6 with ~5% encode time increase.
* RTC speed 11 video: ~3-5% BD-rate gain for VGA and QVGA.

- Perceptual Quality Improvements
* RTC quality improvements for slide changes and scrolling content.

- Speedup and Memory Optimizations
* RTC screen content speedups:
* ~2x speedup for high motion content for speed 11.
* ~2x speedup on key frame coding for speed >= 10.

- Other Improvements
* Reduce bit rate overshoot on slide content.

- Bug Fixes
* rtc: Bug fix for active_maps with sb_size=128.
* b:343429036: rtc: Fix source_sad setting near boundary.
* Fix to QP for temporal enhancement after key frame.
* b:343429192: rtc: Condition QP adjustment on rc->q_1/2_frame > 0.

Thanks,
Wan-Teh Chang