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.

Userland/Libraries/LibEDID/EDID.cpp

@@ -11,7 +11,7 @@
 #include <LibEDID/EDID.h>
 
 #ifdef KERNEL
-#    include <Kernel/StdLib.h>
+#    include <Kernel/Library/StdLib.h>
 #else
 #    include <AK/ScopeGuard.h>
 #    include <Kernel/API/Graphics.h>

Userland/Libraries/LibEDID/EDID.h

@@ -20,7 +20,7 @@
 #include <LibEDID/VIC.h>
 
 #ifdef KERNEL
-#    include <Kernel/KString.h>
+#    include <Kernel/Library/KString.h>
 #else
 #    include <AK/DeprecatedString.h>
 #endif

Userland/Libraries/LibELF/Image.cpp

@@ -16,7 +16,7 @@
 #include <LibELF/Validation.h>
 
 #ifdef KERNEL
-#    include <Kernel/StdLib.h>
+#    include <Kernel/Library/StdLib.h>
 #else
 #    include <string.h>
 #endif