Update Qwt to 6.1.2.
Remove msinttypes library.
Fixes for Qt5.4, remove dependence on msinttypes lib.
qgroundcontrol.pri: comment-out building OSG entirely (was only used for pixhawk 3D indoor map);
Silence unhelpful compiler warnings on on MSVC;
Clean up distribution commands.
Remove some QGC_PROTOBUF_ENABLED code never used.
Fix zooming/scrolling in all plots/charts;
Enforce ground time in mavlink plot.
Add ESC Telemetry Widget.
Update HUD widget to work w/out OpenGL (was causing errors with Qt5). Thanks to main QGC project for updates.
Minor layout tweaks to various forms;
Add current (amps) counter to UAS interface.