ComposeActivity improvements (#548)

* do not add media urls to status text

* add scrolling to content

* add arrow icon and animation to replying-to toggle

* remove unnecessary compose_button_colors.xml

* improve toot button

* improve bottom bar, add bottom sheet for compose options, dedicated cw button

* fix crash on Android < API 21

* move media picking from dialog to bottom sheet

* add small style tootbutton

* fix colors/button background for light theme

* add icons to media chose bottom sheet

* improve hide media button, delete unused styles

* fix crash on dev build when taking photo

* consolidate drawables

* consolidate strings and ids, add tooltips to buttons

* allow media only toots

* change error message to show max size of upload correctly

* fix button color

* add emoji

* code cleanup

* Merge branch 'master' into compose_activity_refactoring

# Conflicts:
#	app/src/main/java/com/keylesspalace/tusky/ComposeActivity.java

* fix hidden snackbar

* improve hint text color

* add SendTootService

* fix timeline refreshing

* toot saving and error handling for sendtootservice

* restructure some code

* convert EditTextTyped to Kotlin

* fixed pick media button disabled color

* force sensitive media when content warning is shown

* add db cache for emojis & fix tests

* reorder buttons to match mastodon web

* add possibility to cancel sending of toot

* correctly delete sent toots

* refresh SavedTootActivity after toot was sent

* remove unused resources

* correct params for toot saving in SendTootService

* consolidate strings

* bugfix

* remove unused resources

* fix notifications on old android for SendTootService

* fix crash

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

@@ -18,4 +18,6 @@
     <dimen name="card_image_vertical_height">160dp</dimen>
     <dimen name="card_image_horizontal_width">100dp</dimen>
 
+    <dimen name="compose_activity_snackbar_elevation">16dp</dimen>
+
 </resources>