Updated the system tray icons to instead use two icons - one for when the timer is active, and the other for when it's not active. This is now hooked up to the start/stop, so we can see what timer state we're in. I don't think this'll be the final icons, as they're not the best quality when scaled down to the system tray size. But they'll do for now as at least we can now see the current 'recording state'.

Icons are from here:

http://findicons.com/icon/418585/button_grey_record (using this for none recording state)
http://findicons.com/icon/418945/button_red_record (using this for recording state)
Merge branch 'develop' into feature/ReportWindow