2019 Emoji Update (#1261)

* Updated EmojiCompat support:
- Fonts are now updatable
  - Old fonts will automatically be deleted
- Noto Emoji is supported
- New library version

* It will now (hopefully) only look through the emoji font directory if it exists...

* Added a noto emoji icon for Android <=6;
Font files and their version relation are only loaded once now.

* Small bugfix for the noto emoji icon

* Changed the initial size of the existingFontFiles list to a constant value

* Bugfixes
Old files are now (really) deleted
The latest version is used as the actuall font
Further optimizations

* Emoji font update triggers restart dialog

* Resized the Noto icon;
(Hopefully) fixed EmojiCompat (again)

app/src/main/res/values/strings.xml

@@ -367,6 +367,7 @@
     <string name="caption_systememoji">Your device\'s default emoji set</string>
     <string name="caption_blobmoji">The Blob emojis known from Android 4.4–7.1</string>
     <string name="caption_twemoji">Mastodon\'s standard emoji set</string>
+    <string name="caption_notoemoji">Google\'s current emoji set</string>
     <string name="emoji_shortcode_format" translatable="false">:%s:</string>
 
     <string name="download_failed">Download failed</string>