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.

Kernel/TTY/PTYMultiplexer.h

@@ -1,7 +1,7 @@
 #pragma once
 
-#include <Kernel/Devices/CharacterDevice.h>
 #include <AK/Badge.h>
+#include <Kernel/Devices/CharacterDevice.h>
 #include <Kernel/Lock.h>
 
 class MasterPTY;

Kernel/TTY/SlavePTY.h

@@ -35,4 +35,3 @@ private:
     InodeIdentifier m_devpts_inode_id;
     String m_tty_name;
 };
-

Kernel/TTY/TTY.h

@@ -52,4 +52,3 @@ private:
     unsigned short m_rows { 0 };
     unsigned short m_columns { 0 };
 };
-

Kernel/TTY/VirtualConsole.h

@@ -1,13 +1,19 @@
 #pragma once
 
-#include <Kernel/TTY/TTY.h>
-#include <Kernel/Devices/KeyboardDevice.h>
 #include "Console.h"
+#include <Kernel/Devices/KeyboardDevice.h>
+#include <Kernel/TTY/TTY.h>
 
-class VirtualConsole final : public TTY, public KeyboardClient, public ConsoleImplementation {
+class VirtualConsole final : public TTY
+    , public KeyboardClient
+    , public ConsoleImplementation {
     AK_MAKE_ETERNAL
 public:
-    enum InitialContents { Cleared, AdoptCurrentVGABuffer };
+    enum InitialContents
+    {
+        Cleared,
+        AdoptCurrentVGABuffer
+    };
 
     VirtualConsole(unsigned index, InitialContents = Cleared);
     virtual ~VirtualConsole() override;
@@ -67,7 +73,8 @@ private:
 
     void execute_escape_sequence(byte final);
 
-    enum EscapeState {
+    enum EscapeState
+    {
         Normal,
         ExpectBracket,
         ExpectParameter,