Highlight green flag if project is running

Resolves: #40

Author: adazem009

src/app/qml/main.qml

@@ -82,6 +82,7 @@ ApplicationWindow {
  id: greenFlagButton
  icon.name: "green_flag"
  icon.color: "transparent"
+ highlighted: player.running
  onClicked: {
  switch (KeyboardInfo.keyboardModifiers()) {
  case Qt.ShiftModifier: