newdevicemodel: deprecate ringdevicemodel in favor of newdevicemodel

Move the devices tab inside the accountgeneraltab.
Add the ability to:
+ Rename the current device
+ Revoke devices

Start to improve the UI of settings.

Change-Id: I6f58f69bf583a0da22c66b6307424e17ec7b1c4c
diff --git a/pixmaps/edit.svg b/pixmaps/edit.svg
new file mode 100644
index 0000000..015dc1b
--- /dev/null
+++ b/pixmaps/edit.svg
@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24">
+    <path d="M3 17.25V21h3.75L17.81 9.94l-3.75-3.75L3 17.25zM20.71 7.04c.39-.39.39-1.02 0-1.41l-2.34-2.34c-.39-.39-1.02-.39-1.41 0l-1.83 1.83 3.75 3.75 1.83-1.83z"/>
+    <path d="M0 0h24v24H0z" fill="none"/>
+</svg>