EmojiCompat support (#600)

* Add EmojiCompat

* EmojiCompat doesn' replace all emojis anymore

* This app should be now capable of loading a EmojiCompat-font located in a file somewhere inside the device's storage

* Should now replace all emojis

* Add EmojiCompat support to EditTextTyped

* Provide EmojiCompat fonts

* The app won't crash anymore when no emoji font is available.
Emoji font should now be located at [Private external app directory]/files/EmojiCompat.ttf

* Removed BundledEmojiCompat dependency

Since this EmojiCompat-implementation does not rely on BundledEmojiCompat, there's no reason to have it enabled.

* Update EditTextTyped.kt

Since connection isn't assigned to (I tried doing so), it can be declared final/val again.

* Update README.md

* Add some non-working emoji preferences

* Add a short font list for testing

* Finished implementation

* Add Twemoji to font list

* Update documentation, more comments

* Delete AssetEmojiCompat which is obsolete now

* Update the font list

* Update the font list

* Fix font list & add Exception handling for malformed JSON files (hopefully)

* More fixes. It should work now...

* Removed AssetEmojiCompat (again)

* Add most of the changes

* Improved the EmojiCompat dialog's style

* The font list is now based on a static layout without external files

* Re-add the real font URL for Twemoji

* Emoji-font captions are now translatable

* Removed one unused String (loading)

* Removed emoji fonts from this repo

* Applied changes from the PR change requests

* The correct emoji font will be selected after cancelling a change

* Add details on the EmojiCompat fonts available (not shown yet)

* Add licensing information on Twemoji and Blobmoji

* Reworked some strings

* Moved FileEmojiCompat to its own library

* Update FileEmojiCompat to the latest version (1.0.3)

* EmojiCompat bug should be fixed

* Better handling of failed downloads

* Removed one TODO

Signed-off-by: Constantin A <10349490+C1710@users.noreply.github.com>

* Update emoji attribution strings

Signed-off-by: Constantin A <10349490+C1710@users.noreply.github.com>

* Fixed some misspelled strings

Signed-off-by: Constantin A <10349490+C1710@users.noreply.github.com>

app/src/main/res/xml/preferences.xml

@@ -12,6 +12,12 @@
             android:summary="%s"
             android:title="@string/pref_title_app_theme" />
 
+        <com.keylesspalace.tusky.EmojiPreference
+            android:defaultValue="@string/system_default"
+            android:key="emojiCompat"
+            android:summary="@string/system_default"
+            android:title="@string/emoji_style"/>
+
         <ListPreference
             android:defaultValue="medium"
             android:entries="@array/status_text_size_names"