* update go-storage dependency, for S3Storage manually call PutObject() so we can set content-type
* update calls to PutFile() to include the contentType
* initial work replacing our media decoding / encoding pipeline with ffprobe + ffmpeg
* specify the video codec to use when generating static image from emoji
* update go-storage library (fixes incompatibility after updating go-iotools)
* maintain image aspect ratio when generating a thumbnail for it
* update readme to show go-ffmpreg
* fix a bunch of media tests, move filesize checking to callers of media manager for more flexibility
* remove extra debug from error message
* fix up incorrect function signatures
* update PutFile to just use regular file copy, as changes are file is on separate partition
* fix remaining tests, remove some unneeded tests now we're working with ffmpeg/ffprobe
* update more tests, add more code comments
* add utilities to generate processed emoji / media outputs
* fix remaining tests
* add test for opus media file, add license header to utility cmds
* limit the number of concurrently available ffmpeg / ffprobe instances
* reduce number of instances
* further reduce number of instances
* fix envparsing test with configuration variables
* update docs and configuration with new media-{local,remote}-max-size variables
* update to use go-storage/ instead of go-store/v2/storage/
* pull in latest version from codeberg
* remove test output 😇
* add code comments
* set the exclusive bit when creating new files in disk config
* bump to actual release version
* bump to v0.1.1 (tis a simple no-logic change)
* update readme
* only use a temporary read seeker when decoding video if required (should only be S3 now)
* use fastcopy library to use memory pooled buffers when calling TempFileSeeker()
* update to use seek call in serveFileRange()
