Add clang-format file

Also run it across the whole tree to get everything using the One True Style.
We don't yet run this in an automated fashion as it's a little slow, but
there is a snippet to do so in makeall.sh.

Servers/WindowServer/WSWindowType.h

@@ -1,6 +1,7 @@
 #pragma once
 
-enum class WSWindowType {
+enum class WSWindowType
+{
     Invalid = 0,
     Normal,
     Menu,