Hieroglyphics support

Mostly as a demonstration of how easy this is with MWExtensionNode.

The icon was chosen with the following criteria:
1. Recognisable (the ankh is quite common in popular culture, right?)
2. Doesn't look idiotic to academics (I've consulted an Egyptology
   PhD and they can confirm it's not the glyph for penis)
3. Renders well at <16x16

That said it does look a little like a stick man...

Bug: 43118

Change-Id: I9f9e8af501401866bfeecf0eec3690a705fbd4db