Share sheet previews (AND-139)

mastodon/src/main/res/layout/fragment_profile_qr.xml

@@ -5,7 +5,8 @@
 	android:orientation="vertical"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
-	android:clipChildren="false">
+	android:clipChildren="false"
+	android:clipToPadding="false">
 
 	<include layout="@layout/profile_qr_toolbar" />
 

mastodon/src/main/res/values/strings.xml

@@ -709,4 +709,6 @@
 	<string name="image_saved">Image saved.</string>
 	<string name="video_saved">Video saved.</string>
 	<string name="view_file">View</string>
+	<string name="share_sheet_preview_profile">%s on Mastodon</string>
+	<string name="share_sheet_preview_post">%1$s on Mastodon: “%2$s”</string>
 </resources>

mastodon/src/main/res/xml/fileprovider_paths.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths>
+	<cache-path name="image_cache" path="images/"/>
+</paths>