Add plugin to convert subs to srt and add a tiered CRF with retries based on size

[nathanpw]

I created the following merge for this.: https://github.com/HaveAGitGat/Tdarr_Plugins/pull/386

I have been using the tiered CRF with retries for awhile. It has processed most of my rather large library. Thought I would contribute it to the community. It is based off of Tdarr_Plugin_vdka_Tiered_CPU_CRF_Based_Configurable.

The plugin to convert subtitles is rather new, but seems to work for my test cases. It is based on Tdarr_Plugin_MP01_MichPasCleanSubsAndAudioCodecs.

I ran the linter, and fixed all the syntax/code issues. I unfortunately, was not able to figure out (nor had the time) to work out the automated tests. My npm/js experience is rather limited. =/

I also ran check plugins but couldn't get it to pass in my local. The issues I ran into didn't appear to be because of my changes.

Anyhow, hope this helps someone!

Edit to add, thanks for the great software!

[nathanpw]

Closing as I think you can do most of what this did in the new flows. I had a quick look but didn't fully try it out. Again, thanks for all your efforts!