Add references to recent papers and testing methodology and update the...

Add references to recent papers and testing methodology and update the CHANGELOG.md with work done since v1.7.0

CHANGELOG.md

 # Changelog
 
+## [1.8.0] - 2023-12-11
+
+Encoder
+- Improve the tradeoffs for the random access mode across presets:
+- Speedup CRF presets M6 to M0 by 17-53% while maintaining similar quality levels
+- Re-adjust CRF presets M7 to M13 for better quality with BD-rate gains ranging from 1-4%
+- Improve the quality and speed of the 1-pass VBR mode
+- More details on the per preset improvements can be found in MR !2143
+- Add API allowing to update bitrate / CRF and Key_frame placement during the encoding session for CBR lowdelay mode and CRF Random Access mode
+- ARM Neon SIMD optimizations for most critical kernels allowing for a 4.5-8x fps speedup vs the c implementation
+
+Cleanup and bug fixes and documentation
+- Various cleanups and functional bug fixes
+- Update the documentation for preset options and individual features
+
 ## [1.7.0] - 2023-08-23
 
 Encoder

README.md

@@ -56,6 +56,9 @@ License 1.0. See [LICENSE](LICENSE.md) and [PATENTS](PATENTS.md) for details.
 - [SPIE 2020](https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11510/1151021/The-SVT-AV1-encoder--overview-features-and-speed-quality/10.1117/12.2569270.full)
 - [SPIE 2021](https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11842/118420T/Towards-much-better-SVT-AV1-quality-cycles-tradeoffs-for-VOD/10.1117/12.2595598.full)
 - [SVT-AV1 - Tech Blog 2022](https://networkbuilders.intel.com/blog/svt-av1-enables-highly-efficient-large-scale-video-on-demand-vod-services)
+- [SPIE 2022](https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12226/122260S/Enhancing-SVT-AV1-with-LCEVC-to-improve-quality-cycles-trade/10.1117/12.2633882.full)
+- [Adaptive Steaming Common Test Conditions](https://aomedia.org/docs/SIWG-D001o.pdf)
+- [ICIP 2023](https://arxiv.org/abs/2307.05208)
 
 **Design Documents**
 - [Encoder Design](Docs/svt-av1-encoder-design.md)