[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, 71 deletions

diff --git a/vendor/github.com/golang/geo/s2/region.go b/vendor/github.com/golang/geo/s2/region.go
deleted file mode 100644
index 9ea3de1ca..000000000
--- a/vendor/github.com/golang/geo/s2/region.go
+++ /dev/null
@@ -1,71 +0,0 @@
-// Copyright 2014 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
-
-// A Region represents a two-dimensional region on the unit sphere.
-//
-// The purpose of this interface is to allow complex regions to be
-// approximated as simpler regions. The interface is restricted to methods
-// that are useful for computing approximations.
-type Region interface {
-	// CapBound returns a bounding spherical cap. This is not guaranteed to be exact.
-	CapBound() Cap
-
-	// RectBound returns a bounding latitude-longitude rectangle that contains
-	// the region. The bounds are not guaranteed to be tight.
-	RectBound() Rect
-
-	// ContainsCell reports whether the region completely contains the given region.
-	// It returns false if containment could not be determined.
-	ContainsCell(c Cell) bool
-
-	// IntersectsCell reports whether the region intersects the given cell or
-	// if intersection could not be determined. It returns false if the region
-	// does not intersect.
-	IntersectsCell(c Cell) bool
-
-	// ContainsPoint reports whether the region contains the given point or not.
-	// The point should be unit length, although some implementations may relax
-	// this restriction.
-	ContainsPoint(p Point) bool
-
-	// CellUnionBound returns a small collection of CellIDs whose union covers
-	// the region. The cells are not sorted, may have redundancies (such as cells
-	// that contain other cells), and may cover much more area than necessary.
-	//
-	// This method is not intended for direct use by client code. Clients
-	// should typically use Covering, which has options to control the size and
-	// accuracy of the covering. Alternatively, if you want a fast covering and
-	// don't care about accuracy, consider calling FastCovering (which returns a
-	// cleaned-up version of the covering computed by this method).
-	//
-	// CellUnionBound implementations should attempt to return a small
-	// covering (ideally 4 cells or fewer) that covers the region and can be
-	// computed quickly. The result is used by RegionCoverer as a starting
-	// point for further refinement.
-	CellUnionBound() []CellID
-}
-
-// Enforce Region interface satisfaction.
-var (
-	_ Region = Cap{}
-	_ Region = Cell{}
-	_ Region = (*CellUnion)(nil)
-	_ Region = (*Loop)(nil)
-	_ Region = Point{}
-	_ Region = (*Polygon)(nil)
-	_ Region = (*Polyline)(nil)
-	_ Region = Rect{}
-)