Qt: update to 5.3
Ground/NewsPanel - Added author avatar and link
GCS/Welcome plugin - renamed NewsPanel to GitHubNews and added ForumNews
UAVOFrSKYSPortBridge: fixed comments and function names
Merge branch 'frskysport' into draco
makefile: filter ARCHFLAGS env var from user environment

Unexpected values in this variable can cause strange compile
failures.
Merge pull request #1205 from solidgoldbomb/sanitize-archflags

makefile: filter ARCHFLAGS env var from user environment
Merge pull request #1202 from guilhermito/welcomePlugin

Welcome plugin
Qt5.3: fix path to windows qmake and dlls
Qt5.3: remove duplicate usb method definitions

These were removed from some versions of mingw but no
longer need to be redefined.
Merge pull request #1198 from peabody124/qt5.3

Qt: update to 5.3
Qt5.3: update dll from 51 to 52

This follows the changes with the MinGW packaged
with Qt5.3
Merge pull request #1208 from peabody124/qt5.3

Qt5.3: update dll from 51 to 52
Merge remote-tracking branch 'upstream/next' into draco