Asynchronous music-metadata updates while streaming (#1449)

* Ensure that default file/protocol handlers are re-installed after updating.

Previously, they were only installed when the preference was changed.
This caused the handlers to point to non-existing files after updates
occurred and older versions were removed by Squirrel.

Closes #791, #911.

* webtorrent/webtorrent-desktop#1340: Switch to async metadata updates.

* Use fat arrow

* Fix issue track number not displayed if total number of tracks is not defined (common.track.of === null).

* Add disk number in addition to track number.

* Update order of audio properties from: album, track, disk, format to track, disk, album, format

* #1340 Update music-metadata to 2.5.0, enabling async 'per' tag updates
#1452 Fix for playing some '.m4b' files

* #1340 Commented out the metadata event debug output.

* #1340 Remove line comment to get rid of max line length lint error

* Update music-metadata 2.6.0 to fix some async events are getting triggered.

* Return JSX block.

* Get rid of third parameter which is replaced by CSS capitalize

* Fixed error when value is undefined.

* Update music-metadata dependency to 2.6.1.

* fix(package): update music-metadata to version 3.1.0

Closes #1478

* Revert "Ensure that default file/protocol handlers are re-installed after updating."

This reverts commit 39145b2366.

package.json

@@ -32,7 +32,7 @@
     "location-history": "^1.0.0",
     "material-ui": "^0.17.0",
     "mkdirp": "^0.5.1",
-    "music-metadata": "^2.4.2",
+    "music-metadata": "^3.1.0",
     "network-address": "^1.1.0",
     "parse-torrent": "^6.0.1",
     "prettier-bytes": "^1.0.1",