Simplify excessively convoluted camera logic

1) QuickCamera logic moved into CameraView

2) The strategies for texture vs. surface view were too complex
   with no observed gain. Better to remove and have to re-add
   if necessary than assume it to be necessary.

3) Drop CWAC-Camera dependency - the device profiles weren't being
   used very much and even that is deprecated so we'd be left on
   our own with new hardware. Not worth it.

4) Selfies first.

5) Layout/orientation mathy logic from CWAC moved into CameraUtils,
   with the  hopes that most of it might be further simplified or
   rendered unnecessary in the future.

Closes #4326

// FREEBIE

res/layout/quick_attachment_drawer.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <merge xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <org.thoughtcrime.securesms.components.camera.QuickCamera
+    <org.thoughtcrime.securesms.components.camera.CameraView
         android:id="@+id/quick_camera"
         android:layout_width="match_parent"
         android:layout_height="match_parent"

res/layout/quick_camera_controls.xml

@@ -31,7 +31,7 @@
                  android:layout_alignParentBottom="true"
                  android:layout_alignParentLeft="true"
                  android:background="#00000000"
-                 android:src="@drawable/quick_camera_front"
+                 android:src="@drawable/quick_camera_rear"
                  android:padding="20dp"
                  android:visibility="invisible"
                  tools:visibility="visible" />

res/layout/quick_camera_controls_land.xml

@@ -31,7 +31,7 @@
                  android:layout_alignParentTop="true"
                  android:layout_alignParentRight="true"
                  android:background="#00000000"
-                 android:src="@drawable/quick_camera_front"
+                 android:src="@drawable/quick_camera_rear"
                  android:padding="20dp"
                  android:visibility="invisible"
                  tools:visibility="visible"/>