Updates to MMB orbit and photomode

• changed middle mouse orbit sensitivity range (from camera sensitivity)
  
• added some help on resources and the buildine to splash and controller screen
  
• changed icon what tower will be selected next (nearest to cursor in ground mode)
  
• made photomode mouse hardwaremouse
  
• allowed photomode camera to tilt to 90 degrees
  
• hid photomode keys when moving the camera
  
• added a play/pause button to photomode (Space Bar/ Left Stick Down)
  
• screenshot button ingame only responds to when you release the key/button
  
• photomode keys for play/pause and respawn/rewind added to the photomode controls list
  

As always stuff may break, let me know if it does.