[needs help] Support announcements (#1977)

* Implement announcements activity

* Update reactions without api access

* Add badge style

* Use emptyList() as default parameter

* Simplify newIntent

* Use List instead of Array

* Remove unneeded ConstraintLayout

* Add lineSpacingMultiplier

* Fix wording

* Apply material design's default chip style

* Dismiss announcements automatically

app/src/main/java/com/keylesspalace/tusky/view/EmojiPicker.kt

@@ -0,0 +1,17 @@
+package com.keylesspalace.tusky.view
+
+import android.content.Context
+import android.util.AttributeSet
+import androidx.recyclerview.widget.GridLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+
+class EmojiPicker @JvmOverloads constructor(
+        context: Context,
+        attrs: AttributeSet? = null
+) : RecyclerView(context, attrs) {
+
+    init {
+        clipToPadding = false
+        layoutManager = GridLayoutManager(context, 3, GridLayoutManager.HORIZONTAL, false)
+    }
+}