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/Net/NetworkAdapter.cpp

@@ -6,10 +6,10 @@
 
 #include <Kernel/Heap/kmalloc.h>
 #include <Kernel/InterruptDisabler.h>
+#include <Kernel/Library/StdLib.h>
 #include <Kernel/Net/EtherType.h>
 #include <Kernel/Net/NetworkAdapter.h>
 #include <Kernel/Net/NetworkingManagement.h>
-#include <Kernel/StdLib.h>
 #include <Kernel/Tasks/Process.h>
 
 namespace Kernel {