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/Devices/BXVGADevice.h

@@ -1,10 +1,10 @@
 #pragma once
 
-#include <AK/Types.h>
 #include <AK/AKString.h>
-#include <SharedGraphics/Size.h>
-#include <Kernel/PhysicalAddress.h>
+#include <AK/Types.h>
 #include <Kernel/Devices/BlockDevice.h>
+#include <Kernel/PhysicalAddress.h>
+#include <SharedGraphics/Size.h>
 
 class BXVGADevice final : public BlockDevice {
     AK_MAKE_ETERNAL

Kernel/Devices/BlockDevice.h

@@ -10,7 +10,10 @@ public:
     virtual bool is_seekable() const override { return true; }
 
 protected:
-    BlockDevice(unsigned major, unsigned minor) : Device(major, minor) { }
+    BlockDevice(unsigned major, unsigned minor)
+        : Device(major, minor)
+    {
+    }
 
 private:
     virtual bool is_block_device() const final { return true; }

Kernel/Devices/CharacterDevice.h

@@ -7,7 +7,10 @@ public:
     virtual ~CharacterDevice() override;
 
 protected:
-    CharacterDevice(unsigned major, unsigned minor) : Device(major, minor) { }
+    CharacterDevice(unsigned major, unsigned minor)
+        : Device(major, minor)
+    {
+    }
 
 private:
     virtual bool is_character_device() const final { return true; }

Kernel/Devices/DiskDevice.h

@@ -23,4 +23,3 @@ public:
 protected:
     DiskDevice();
 };
-

Kernel/Devices/FileBackedDiskDevice.h

@@ -1,9 +1,9 @@
 #pragma once
 
-#include <Kernel/Devices/DiskDevice.h>
-#include <AK/RetainPtr.h>
 #include <AK/AKString.h>
+#include <AK/RetainPtr.h>
 #include <AK/Types.h>
+#include <Kernel/Devices/DiskDevice.h>
 #include <stdio.h>
 
 class FileBackedDiskDevice final : public DiskDevice {
@@ -30,4 +30,3 @@ private:
     DiskOffset m_file_length { 0 };
     unsigned m_block_size { 0 };
 };
-

Kernel/Devices/FullDevice.h

@@ -16,4 +16,3 @@ private:
     virtual bool can_write(FileDescriptor&) const override { return true; }
     virtual const char* class_name() const override { return "FullDevice"; }
 };
-

Kernel/Devices/IDEDiskDevice.h

@@ -1,9 +1,9 @@
 #pragma once
 
-#include <Kernel/Lock.h>
 #include <AK/RetainPtr.h>
 #include <Kernel/Devices/DiskDevice.h>
 #include <Kernel/IRQHandler.h>
+#include <Kernel/Lock.h>
 #include <Kernel/PCI.h>
 #include <Kernel/PhysicalAddress.h>
 #include <Kernel/VM/PhysicalPage.h>
@@ -14,7 +14,8 @@ struct PhysicalRegionDescriptor {
     word end_of_table { 0 };
 };
 
-class IDEDiskDevice final : public IRQHandler, public DiskDevice {
+class IDEDiskDevice final : public IRQHandler
+    , public DiskDevice {
     AK_MAKE_ETERNAL
 public:
     static Retained<IDEDiskDevice> create();
@@ -58,4 +59,3 @@ private:
     word m_bus_master_base { 0 };
     Lockable<bool> m_dma_enabled;
 };
-

Kernel/Devices/KeyboardDevice.h

@@ -1,15 +1,16 @@
 #pragma once
 
-#include <AK/Types.h>
-#include <AK/DoublyLinkedList.h>
-#include <AK/CircularQueue.h>
-#include <Kernel/Devices/CharacterDevice.h>
 #include "IRQHandler.h"
 #include "KeyCode.h"
+#include <AK/CircularQueue.h>
+#include <AK/DoublyLinkedList.h>
+#include <AK/Types.h>
+#include <Kernel/Devices/CharacterDevice.h>
 
 class KeyboardClient;
 
-class KeyboardDevice final : public IRQHandler, public CharacterDevice {
+class KeyboardDevice final : public IRQHandler
+    , public CharacterDevice {
     AK_MAKE_ETERNAL
 public:
     using Event = KeyEvent;

Kernel/Devices/NullDevice.h

@@ -18,4 +18,3 @@ private:
     virtual bool can_read(FileDescriptor&) const override;
     virtual const char* class_name() const override { return "NullDevice"; }
 };
-

Kernel/Devices/PS2MouseDevice.h

@@ -1,11 +1,12 @@
 #pragma once
 
-#include <Kernel/Devices/CharacterDevice.h>
-#include <Kernel/MousePacket.h>
-#include <Kernel/IRQHandler.h>
 #include <AK/CircularQueue.h>
+#include <Kernel/Devices/CharacterDevice.h>
+#include <Kernel/IRQHandler.h>
+#include <Kernel/MousePacket.h>
 
-class PS2MouseDevice final : public IRQHandler, public CharacterDevice {
+class PS2MouseDevice final : public IRQHandler
+    , public CharacterDevice {
 public:
     PS2MouseDevice();
     virtual ~PS2MouseDevice() override;

Kernel/Devices/RandomDevice.h

@@ -18,4 +18,3 @@ private:
     virtual bool can_write(FileDescriptor&) const override { return true; }
     virtual const char* class_name() const override { return "RandomDevice"; }
 };
-

Kernel/Devices/ZeroDevice.h

@@ -16,4 +16,3 @@ private:
     virtual bool can_write(FileDescriptor&) const override { return true; }
     virtual const char* class_name() const override { return "ZeroDevice"; }
 };
-