[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, 53 deletions

diff --git a/vendor/github.com/golang/geo/s2/bits_go18.go b/vendor/github.com/golang/geo/s2/bits_go18.go
deleted file mode 100644
index 10a674da5..000000000
--- a/vendor/github.com/golang/geo/s2/bits_go18.go
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright 2018 Google Inc. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// +build !go1.9
-
-package s2
-
-// This file is for the bit manipulation code pre-Go 1.9.
-
-// findMSBSetNonZero64 returns the index (between 0 and 63) of the most
-// significant set bit. Passing zero to this function returns zero.
-func findMSBSetNonZero64(x uint64) int {
-	val := []uint64{0x2, 0xC, 0xF0, 0xFF00, 0xFFFF0000, 0xFFFFFFFF00000000}
-	shift := []uint64{1, 2, 4, 8, 16, 32}
-	var msbPos uint64
-	for i := 5; i >= 0; i-- {
-		if x&val[i] != 0 {
-			x >>= shift[i]
-			msbPos |= shift[i]
-		}
-	}
-	return int(msbPos)
-}
-
-const deBruijn64 = 0x03f79d71b4ca8b09
-const digitMask = uint64(1<<64 - 1)
-
-var deBruijn64Lookup = []byte{
-	0, 1, 56, 2, 57, 49, 28, 3, 61, 58, 42, 50, 38, 29, 17, 4,
-	62, 47, 59, 36, 45, 43, 51, 22, 53, 39, 33, 30, 24, 18, 12, 5,
-	63, 55, 48, 27, 60, 41, 37, 16, 46, 35, 44, 21, 52, 32, 23, 11,
-	54, 26, 40, 15, 34, 20, 31, 10, 25, 14, 19, 9, 13, 8, 7, 6,
-}
-
-// findLSBSetNonZero64 returns the index (between 0 and 63) of the least
-// significant set bit. Passing zero to this function returns zero.
-//
-// This code comes from trailingZeroBits in https://golang.org/src/math/big/nat.go
-// which references (Knuth, volume 4, section 7.3.1).
-func findLSBSetNonZero64(x uint64) int {
-	return int(deBruijn64Lookup[((x&-x)*(deBruijn64&digitMask))>>58])
-}