Added header file with common physical constants.
Updated library functions to use physical constants file.
Updated flight modules to use physical constants file.
Updated PiOS files to use physical constants file.
Updated GCS files to use physical constants file.
Added the shared API directory to simulator targets.
Fixes for header files, floating point trig functions, and incorrect
conversions.
Added shared/api to GCS include directory.
SDL: Mask out more includes
Fixed missing newline.
SDL: Only copy the dll when used
Qt5: Copy icudt49.dll for windows
GCS Configuration: Set fonts that were unspecified

Whatever default font Qt5 was using sucks.
Merge branch 'next' into qt5
Qt5 Path Planner: Need event filter on combox box

Otherwise attempting to select an item in the QComboxBox
makes it simply disappear.  This filters those events from
the background view.

Solution found http://stackoverflow.com/questions/14248036/qcombobox-doesnt-show-its-item-list
Qt5 Browser: Add event filter for QComboBox so they appear properly

Similarly to what was required for the path planner view.
Resolved merge conflict.
Merge pull request #328 from kubark42/phys-constants

Group all physical constants into one file
Merge branch 'next' into qt5

Conflicts:
	ground/gcs/src/plugins/config/cfg_vehicletypes/configccpmwidget.cpp
Merge branch 'qt5' into james_development