[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, 52 deletions

diff --git a/vendor/github.com/dsoprea/go-utility/v2/filesystem/calculate_seek.go b/vendor/github.com/dsoprea/go-utility/v2/filesystem/calculate_seek.go
deleted file mode 100644
index cd59d727c..000000000
--- a/vendor/github.com/dsoprea/go-utility/v2/filesystem/calculate_seek.go
+++ /dev/null
@@ -1,52 +0,0 @@
-package rifs
-
-import (
-	"io"
-	"os"
-
-	"github.com/dsoprea/go-logging"
-)
-
-// SeekType is a convenience type to associate the different seek-types with
-// printable descriptions.
-type SeekType int
-
-// String returns a descriptive string.
-func (n SeekType) String() string {
-	if n == io.SeekCurrent {
-		return "SEEK-CURRENT"
-	} else if n == io.SeekEnd {
-		return "SEEK-END"
-	} else if n == io.SeekStart {
-		return "SEEK-START"
-	}
-
-	log.Panicf("unknown seek-type: (%d)", n)
-	return ""
-}
-
-// CalculateSeek calculates an offset in a file-stream given the parameters.
-func CalculateSeek(currentOffset int64, delta int64, whence int, fileSize int64) (finalOffset int64, err error) {
-	defer func() {
-		if state := recover(); state != nil {
-			err = log.Wrap(state.(error))
-			finalOffset = 0
-		}
-	}()
-
-	if whence == os.SEEK_SET {
-		finalOffset = delta
-	} else if whence == os.SEEK_CUR {
-		finalOffset = currentOffset + delta
-	} else if whence == os.SEEK_END {
-		finalOffset = fileSize + delta
-	} else {
-		log.Panicf("whence not valid: (%d)", whence)
-	}
-
-	if finalOffset < 0 {
-		finalOffset = 0
-	}
-
-	return finalOffset, nil
-}