Drafts v2 (#2032)

* cleanup warnings, reorganize some code

* move ComposeAutoCompleteAdapter to compose package

* composeOptions doesn't need to be a class member

* add DraftsActivity and DraftsViewModel

* drafts

* remove unnecessary Unit in ComposeViewModel

* add schema/25.json

* fix db migration

* drafts

* cleanup code

* fix compose activity rotation bug

* fix media descriptions getting lost when restoring a draft

* improve deleting drafts

* fix ComposeActivityTest

* improve draft layout for almost empty drafts

* reformat code

* show toast when opening reply to deleted toot

* improve item_draft layout

app/build.gradle

@@ -67,6 +67,9 @@ android {
     androidExtensions {
         experimental = true
     }
+    buildFeatures {
+        viewBinding true
+    }
     testOptions {
         unitTests {
             returnDefaultValues = true