button additions and script

duplicated and added buttons for shop and healing alongside empty
building in offline map scene.
added tags Shop, Healing, Empty Building to project and tagged the three
buttons appropriately.
added script to new buttons.
updated gotoexplore script to take into account new tags. will now load
level depending upon which tag the button has (will need other levels
made for that).
tested and ensured buttons work. shop, healing, emtpy building buttons
will print a message to the debug console when clicked.