Fastflix

* Adding AV1 AOM settings for cpu-used, tile-columns, tile-rows, row-mt
* Adding HEVC x265 setting for profile
* Changing plugins to include library used for encoding
* Changing HEVC default speed to "medium" and crf to 28 to match x265 defaults
* Fixing command builders to specify stream instead of video track for codec
* Fixing FPS not showing correctly when dealing with higher numbers
* Fixing 60 video track not selected properly (thanks to -L0Lock-)
* Fixing crash on SVT-AV1 due to HDR label issue
* Fixing SVT-AV1 audio tracks being converted incorrectly

* Adding settings dialog
* Fixing no bitrate should be specified for lossless audio

* Fixing 52 HEVC custom CRF issue (thanks to 2600box)

* Adding larger command line view to see entire command at once
* Changing to using qtpy which supports dynamic linking of either PySide2 or pyqt5, instead of only PySide2
* Fixing 4 Error Message Box when someone other than video file is dropped onto fastflix
* Fixing 44 Remove metadata from original file (thanks to HannesJo0139)
* Fixing 20 Adding hoverhelp for most converter options

* Fixing audio downmixing only taking for last downmixing setting

* Fixing 46 max-cll was being sent incorrectly to x265-params (thanks to HannesJo0139)
* Fixing 43 audio bitrate being set to wrong track (thanks to HannesJo0139)