GCS Share: copy welcome qml files to share directory

This is largely redundant but facilitates using the Qt
deployment tools.
OSX Package: distribute QtQuick files

macdeployqt now works properly. it does requires qml files
for it to parse to exist in the package, so for files that
are in a resource (e.g. welcome) they must be duplicated
to the share directory.
Windows Package: distribute QtQuick files

windeployqt now works properly. it does requires qml files
for it to parse to exist in the package, so for files that
are in a resource (e.g. welcome) they must be duplicated
to the share directory.
OSX: install OSG / SDL

Restore these. No reason not to package if they
are present.
OSX App: switch how we include Info.plist
GCS: forgot to check in Info.plist
PFDQML: switch to QtQuick
Welcome: update to Qt Quick
GCS: fix some compilation warnings
QML View: switch to Qt Quick
PFD: remove broken elements

The roll and pitch indicators were not working
because StabilizationDesiredType is undefined.
Removing these entirely.
Merge pull request #1206 from peabody124/qtquick

Switch from QtDeclarative to QtQuick