Fix linker flags to match across subprojects (for release build)
Undo previous; Attempt to make appveryor happy (again)
Checklist variable substitution, first attempt
Merge remote-tracking branch 'origin/Orbiter2016' into Orbiter2016
Change appveyor to 2017
VS2017 support
Drop VS2015 support
Merge remote-tracking branch 'origin/master' in...