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.

AK/Noncopyable.h

@@ -1,6 +1,6 @@
 #pragma once
 
 #define AK_MAKE_NONCOPYABLE(c) \
-private: \
-    c(const c&) = delete; \
+private:                       \
+    c(const c&) = delete;      \
     c& operator=(const c&) = delete;