Porting of apps to userspace

src/kernel/userland/libc/libui.h

@@ -20,10 +20,15 @@
 #define GUI_EVENT_CLOSE       4
 #define GUI_EVENT_KEY         5
 
+#define GUI_EVENT_MOUSE_DOWN  6
+#define GUI_EVENT_MOUSE_UP    7
+#define GUI_EVENT_MOUSE_MOVE  8
+
 typedef struct {
     int type;
     int arg1; // For click: x
     int arg2; // For click: y
+    int arg3; // For click: button state
 } gui_event_t;
 
 // Window Handle