[feature] support processing of (many) more media types (#3090)

* 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

vendor/github.com/dsoprea/go-utility/v2/filesystem/readwriteseekcloser.go

@@ -1,29 +0,0 @@
-package rifs
-
-import (
-	"io"
-)
-
-// ReadWriteSeekCloser satisfies `io.ReadWriteSeeker` and `io.Closer`
-// interfaces.
-type ReadWriteSeekCloser interface {
-	io.ReadWriteSeeker
-	io.Closer
-}
-
-type readWriteSeekNoopCloser struct {
-	io.ReadWriteSeeker
-}
-
-// ReadWriteSeekNoopCloser wraps a `io.ReadWriteSeeker` with a no-op Close()
-// call.
-func ReadWriteSeekNoopCloser(rws io.ReadWriteSeeker) ReadWriteSeekCloser {
-	return readWriteSeekNoopCloser{
-		ReadWriteSeeker: rws,
-	}
-}
-
-// Close does nothing but allows the RWS to satisfy `io.Closer`.:wq
-func (readWriteSeekNoopCloser) Close() (err error) {
-	return nil
-}