[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/polyline_measures.go b/vendor/github.com/golang/geo/s2/polyline_measures.go
deleted file mode 100644
index 38ce991b5..000000000
--- a/vendor/github.com/golang/geo/s2/polyline_measures.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.
-
-package s2
-
-// This file defines various measures for polylines on the sphere. These are
-// low-level methods that work directly with arrays of Points. They are used to
-// implement the methods in various other measures files.
-
-import (
-	"github.com/golang/geo/r3"
-	"github.com/golang/geo/s1"
-)
-
-// polylineLength returns the length of the given Polyline.
-// It returns 0 for polylines with fewer than two vertices.
-func polylineLength(p []Point) s1.Angle {
-	var length s1.Angle
-
-	for i := 1; i < len(p); i++ {
-		length += p[i-1].Distance(p[i])
-	}
-	return length
-}
-
-// polylineCentroid returns the true centroid of the polyline multiplied by the
-// length of the polyline. The result is not unit length, so you may wish to
-// normalize it.
-//
-// Scaling by the Polyline length makes it easy to compute the centroid
-// of several Polylines (by simply adding up their centroids).
-//
-// Note that for degenerate Polylines (e.g., AA) this returns Point(0, 0, 0).
-// (This answer is correct; the result of this function is a line integral over
-// the polyline, whose value is always zero if the polyline is degenerate.)
-func polylineCentroid(p []Point) Point {
-	var centroid r3.Vector
-	for i := 1; i < len(p); i++ {
-		centroid = centroid.Add(EdgeTrueCentroid(p[i-1], p[i]).Vector)
-	}
-	return Point{centroid}
-}