Log Message:
svt-av1: update to 1.5.0.

## [1.5.0] - 2023-04-25

Encoder
- Optimize the tradeoffs for M0-M13 speeding up M5-M1 by 15-30% and improving \ 
the BDR of M6-M13 by 1-3%
- Create a new preset MR (--preset -1) to be the quality reference
- Optimize the tradeoffs for M8-M13 in the low delay encoding mode (!2052 !2096 \ 
and !2102) for SC and non-SC modes
- Add dynamic minigop support for the random access configuration enabled by \ 
default in M9 and below
- Add support to allow users to specify lambda scaling factors through the \ 
commandline
- Rewrite the gstreamer plugin and updating it to be uptodate with the latest \ 
API changes
- Add skip frames feature allowing the user to start encoding after n frames in \ 
the file
- Add ability to specify a smaller startup minigop size for every gop to enable \ 
faster prefetching
- Fix segmentation support and re-enable it with --aq-mode 1 to allow work on \ 
the region of interest API
- Add padding bytes to the EbSvtAv1EncConfiguration configuration structure keep \ 
its size unchanged until v2.0

Build, Cleanup and Documentation
- Major cleanups for unused variables, static functions, and comments formatting
- Reduce the size of variables
- Refine app level parsing and reference scaling API calls in the application
- Add dynamic minigop documentation along with updating the documentation accordingly