Create menu for timeline fragment

app/src/main/java/com/futo/circles/extensions/LiveDataExtensions.kt

@@ -2,7 +2,6 @@ package com.futo.circles.extensions
 
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.LiveData
-import androidx.lifecycle.Observer
 import org.matrix.android.sdk.api.failure.Failure
 
 fun <T> LiveData<Response<T>>.observeResponse(
@@ -24,9 +23,9 @@ fun <T> LiveData<Response<T>>.observeResponse(
 
 fun <T> LiveData<T>.observeData(fragment: Fragment, observer: (T) -> Unit) {
     val owner = fragment.viewLifecycleOwner
-    observe(owner, Observer {
+    observe(owner) {
         if (it != null) observer(it)
-    })
+    }
 }
 
 suspend fun <T> createResult(block: suspend () -> T): Response<T> {

app/src/main/res/drawable/ic_invite.xml

+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="@color/inactive_menu_icon_color"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M15,12c2.21,0 4,-1.79 4,-4s-1.79,-4 -4,-4 -4,1.79 -4,4 1.79,4 4,4zM6,10L6,7L4,7v3L1,10v2h3v3h2v-3h3v-2L6,10zM15,14c-2.67,0 -8,1.34 -8,4v2h16v-2c0,-2.66 -5.33,-4 -8,-4z" />
+</vector>

app/src/main/res/menu/group_timeline_menu.xml

+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item
+        android:id="@+id/inviteMembers"
+        android:icon="@drawable/ic_invite"
+        android:title="@string/invite_members" />
+
+
+</menu>
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