Kernel: Do a big rewrite of PS/2 code

Command sending+response reading is now synchronized. This allows
bochs to properly initialize both mouse and keyboard simultaneously.

Also status register is checked EVERY time read/write to other IO
ports is performed.

kernel/kernel/Errors.cpp

@@ -8,10 +8,6 @@ namespace Kernel
 		"ACPI could not find root SDT header"sv,
 		"ACPI no such header"sv,
 		"ACPI root invalid",
-		"PS/2 device timeout"sv,
-		"PS/2 controller self test failed"sv,
-		"PS/2 reset failed"sv,
-		"PS/2 unsupported device"sv,
 		"Invalid ext2 filesystem"sv,
 		"Ext2 filesystem corrupted"sv,
 		"Ext2 filesystem out of inodes"sv,