Removed the ICONDIR token from the CSS styles; it wasn't necessary and slowed down applying new styles to QGC.

Selecting the desired stylesheet now works correctly, including saving settings between application launches.

Reworked the styling UI. Now there are 4 options: light, dark, custom_light, and custom_dark. Things don't quite work right, but the proof-of-concept is done.

Further styling changes to the outdoor stylesheet. The indoor sheet was modified as inline styles are removed from the C++ code.

Some .ui files still pointed to an old mavground.qrc file. They now point to the proper qgroundcontrol.qrc file.

Removed commented-out references to setStyleSheet(). Moving towards all styles being set in .css files

Changes for new calibration in APM 3.0 (Re: https://github.com/diydrones/MissionPlanner/issues/38), and change in some of the serial timeouts

Addition of requesting status updates from APM, if APM is in a state with no status updates, this will request them

Change so Waypoints are the same across maps, and offline waypoints get appeneded to the end of the MAV's waypoint list on connect

Started adding numbers to QGC_APPLICATION_VERSION for development builds, since dev builds need the config file wiped out for UI changes to be visible

Fix for crash when removing item from QuickView, and addition of more generic signal/slot combonation for property updates