change keyboard demo to event listener

c_os/kernel/Globals.cc

@@ -18,9 +18,11 @@ VESA vesa;        // VESA-Treiber
 PIC pic;               // Interrupt-Controller
 IntDispatcher intdis;  // Unterbrechungsverteilung
 PIT pit(10000);
-Keyboard kb;  // Tastatur
 PCSPK pcspk;  // PC-Lautsprecher
 
+Keyboard kb;  // Tastatur
+KeyEventManager kevman;
+
 // BumpAllocator         allocator;
 LinkedListAllocator allocator;
 // TreeAllocator allocator;