Everywhere: Move global Kernel pattern code to Kernel/Library directory

This has KString, KBuffer, DoubleBuffer, KBufferBuilder, IOWindow,
UserOrKernelBuffer and ScopedCritical classes being moved to the
Kernel/Library subdirectory.

Also, move the panic and assertions handling code to that directory.

Kernel/TTY/ConsoleManagement.cpp

@@ -9,7 +9,7 @@
 #include <Kernel/Debug.h>
 #include <Kernel/Devices/DeviceManagement.h>
 #include <Kernel/Graphics/GraphicsManagement.h>
-#include <Kernel/Panic.h>
+#include <Kernel/Library/Panic.h>
 #include <Kernel/Sections.h>
 #include <Kernel/TTY/ConsoleManagement.h>
 

Kernel/TTY/MasterPTY.h

@@ -8,7 +8,7 @@
 
 #include <AK/Badge.h>
 #include <Kernel/Devices/CharacterDevice.h>
-#include <Kernel/DoubleBuffer.h>
+#include <Kernel/Library/DoubleBuffer.h>
 
 namespace Kernel {
 

Kernel/TTY/TTY.h

@@ -8,7 +8,7 @@
 
 #include <AK/CircularDeque.h>
 #include <Kernel/Devices/CharacterDevice.h>
-#include <Kernel/DoubleBuffer.h>
+#include <Kernel/Library/DoubleBuffer.h>
 #include <Kernel/Library/LockWeakPtr.h>
 #include <Kernel/Tasks/ProcessGroup.h>
 #include <Kernel/UnixTypes.h>

Kernel/TTY/VirtualConsole.cpp

@@ -16,8 +16,8 @@
 #include <Kernel/Devices/HID/Management.h>
 #include <Kernel/Graphics/GraphicsManagement.h>
 #include <Kernel/Heap/kmalloc.h>
+#include <Kernel/Library/StdLib.h>
 #include <Kernel/Sections.h>
-#include <Kernel/StdLib.h>
 #include <Kernel/TTY/ConsoleManagement.h>
 #include <Kernel/TTY/VirtualConsole.h>
 #include <LibVT/Color.h>