Improved Comments in whole emulator. Finalized emulator section in docu.

emulator/qt/ll_system.cpp

@@ -6,18 +6,18 @@ extern "C" {
 }
 
 bool ll_system_init() {
-    return true;
+    return true; //nothing to initialize here, apart from the stuff which is done in the main method.
 }
 
 void ll_system_delay(uint32_t msec) {
-        QThread::msleep(msec);
+        QThread::msleep(msec); //Let the app_process() Thread sleep
 }
 
 void ll_system_process() {
-        QApplication::processEvents();
-        QThread::msleep(1);
+        QApplication::processEvents(); //Process pending qt events
+        QThread::msleep(1); //Sleep for 1ms, to keep the cpu load down
 }
 
 void ll_system_toggle_led() {
-
+    //No led emulated :(
 }