[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

1 files changed, 0 insertions, 36 deletions

diff --git a/vendor/github.com/dsoprea/go-utility/v2/filesystem/read_counter.go b/vendor/github.com/dsoprea/go-utility/v2/filesystem/read_counter.go
deleted file mode 100644
index d878ca4e6..000000000
--- a/vendor/github.com/dsoprea/go-utility/v2/filesystem/read_counter.go
+++ /dev/null
@@ -1,36 +0,0 @@
-package rifs
-
-import (
-	"io"
-)
-
-// ReadCounter proxies read requests and maintains a counter of bytes read.
-type ReadCounter struct {
-	r       io.Reader
-	counter int
-}
-
-// NewReadCounter returns a new `ReadCounter` struct wrapping a `Reader`.
-func NewReadCounter(r io.Reader) *ReadCounter {
-	return &ReadCounter{
-		r: r,
-	}
-}
-
-// Count returns the total number of bytes read.
-func (rc *ReadCounter) Count() int {
-	return rc.counter
-}
-
-// Reset resets the counter to zero.
-func (rc *ReadCounter) Reset() {
-	rc.counter = 0
-}
-
-// Read forwards a read to the underlying `Reader` while bumping the counter.
-func (rc *ReadCounter) Read(b []byte) (n int, err error) {
-	n, err = rc.r.Read(b)
-	rc.counter += n
-
-	return n, err
-}