The old Mac launcher doesn’t work on Yosemite, add a tiny
Qt-based launcher inside the main process (no need to fork /
exec) which runs before the OSG window is created.
Will be merged for 3.4, hopefully with no impact on other
platforms.
By Gijs with additions by James. Menubar is disabled at present
since it's not usable and potentially inferior to other solutions,
but committing the code so it doesn't rot.
This allows us to display a platform-native dialog for problems
which occur early in startup (before we can show a PUI/Canvas dialog).
In particular this improves feedback where FG_HOME, FG_DATA or
aircraft selection is wrong, all of which happen very early in startup.
This adds the framework for platform cursor implementations; Windows and X11 to be done.
It also extend the mouse-input code to generate hover events suitable for driving tooltips.
Note there should be no visible functionality change from this commit, since everything
is inactive until fgdata changes are made.
