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.

AK/Assertions.h

@@ -7,7 +7,7 @@
 #pragma once
 
 #if defined(KERNEL)
-#    include <Kernel/Assertions.h>
+#    include <Kernel/Library/Assertions.h>
 #else
 #    include <assert.h>
 extern "C" __attribute__((noreturn)) void ak_verification_failed(char const*);

AK/Hex.h

@@ -11,7 +11,7 @@
 #include <AK/StringView.h>
 
 #ifdef KERNEL
-#    include <Kernel/KString.h>
+#    include <Kernel/Library/KString.h>
 #else
 #    include <AK/DeprecatedString.h>
 #endif

AK/IPv4Address.h

@@ -14,7 +14,7 @@
 
 #ifdef KERNEL
 #    include <AK/Error.h>
-#    include <Kernel/KString.h>
+#    include <Kernel/Library/KString.h>
 #else
 #    include <AK/DeprecatedString.h>
 #    include <AK/String.h>

AK/IPv6Address.h

@@ -14,7 +14,7 @@
 
 #ifdef KERNEL
 #    include <AK/Error.h>
-#    include <Kernel/KString.h>
+#    include <Kernel/Library/KString.h>
 #else
 #    include <AK/DeprecatedString.h>
 #endif

AK/MACAddress.h

@@ -13,7 +13,7 @@
 #include <AK/Vector.h>
 
 #ifdef KERNEL
-#    include <Kernel/KString.h>
+#    include <Kernel/Library/KString.h>
 #else
 #    include <AK/DeprecatedString.h>
 #endif

AK/Memory.h

@@ -10,7 +10,7 @@
 #include <AK/Types.h>
 
 #if defined(KERNEL)
-#    include <Kernel/StdLib.h>
+#    include <Kernel/Library/StdLib.h>
 #else
 #    include <string.h>
 #endif

AK/Singleton.h

@@ -11,8 +11,8 @@
 #include <AK/Noncopyable.h>
 #ifdef KERNEL
 #    include <Kernel/Arch/Processor.h>
+#    include <Kernel/Library/ScopedCritical.h>
 #    include <Kernel/Locking/SpinlockProtected.h>
-#    include <Kernel/ScopedCritical.h>
 #elif defined(AK_OS_WINDOWS)
 // Forward declare to avoid pulling Windows.h into every file in existence.
 extern "C" __declspec(dllimport) void __stdcall Sleep(unsigned long);

AK/StringUtils.cpp

@@ -15,7 +15,7 @@
 #include <AK/Vector.h>
 
 #ifdef KERNEL
-#    include <Kernel/StdLib.h>
+#    include <Kernel/Library/StdLib.h>
 #else
 #    include <AK/DeprecatedString.h>
 #    include <AK/FloatingPointStringConversions.h>

AK/UUID.h

@@ -12,7 +12,7 @@
 #include <AK/Types.h>
 
 #ifdef KERNEL
-#    include <Kernel/KString.h>
+#    include <Kernel/Library/KString.h>
 #else
 #    include <AK/String.h>
 #endif