Kernel: Rewrite the whole input system

PS/2 code is now kind of messed up, but it works. Keyboards and mice are
now an abstract class that is automatically exposed to userspace. This
will make adding USB input much nicer.

userspace/tests/test-mouse/main.cpp

@@ -50,7 +50,7 @@ void cleanup()
 int main(int argc, char** argv)
 {
 	const char* fb_path = "/dev/fb0";
-	const char* mouse_path = "/dev/input1";
+	const char* mouse_path = "/dev/mouse0";
 
 	if (argc == 1)
 		;