Add QGC::fuzzyCompare which works in all cases

this simple patch cleans more than 500 warnings on my build
and it should be really safe to apply since it basically remove
unused variables.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

This way we don't need macro-magic to deal with
different operating systems and compilers.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

We just wanna move some code from QThread, from private
to public, se can use using:: for that.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

This shouldn't break a thing on other linux boxes that compiles
fine.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Remove isnan() and isinf() templates from QGC.h for Windows builds, this
generates errors (already defined in math.h).

Removed a lot of verbose debug output, added connection indication to main menu bar to improve situational awareness of operator

Code changes to reflect new header information (sysid, compid, timestamp) in protobuf messages. Added protobuf message timeout; old messages will not be visualized. Fixed getParameterValue in ParamManager; the method can segfault if the component id or parameter id is not valid.

Added angle conversion testing, added battery settings option, added option to set MAVLink ID of groundstation

Added version check for settings to prevent application crashes because of old, incompatible settings

Added not yet working version of logging / log replay, fixed ALL bugs in main window, enabled full persistence in main window and serial link.

Added new options for windows serial port, fixed a number of bugs, added customizing options to instrument widgets

Substantially bugfixed and improved deactivation/activation and persistence of widgets. A lot of testing of Google Earth view, only minor improvements