Major cmake changes to get qt5.2 building
Tracking the qt method rename.
User QStandardPaths instead.
Explicit toString() required.
Tracking method rename.
Plastique no longer exists
Change order to get moc's
Include macextras
Remaining source changes to get to compile.
cmake build system: osx - install qt5 platform plugins
move sclang to the MacOS directory with the app executable

QT plugin loading is determined in part by the qt.conf file, which points to a Plugin dir. sclang seems to get confused by being adjacent to that file, and misunderstanding where it should load plugins from. Simply moving sclang is the simplest way I found to ensure both the IDE and sclang load plugins and do runtime linking successfully. There MAY be a better solution to be had - enabling the QT_DEBUG_PLUGINS env flag helps show what's going on - but this is working, and /MacOS is a fine and possibly more appropriate place for sclang anyway, so there it stays.
Make sure both sclang and scsynth are passed in to install_qt5_executable, just in case.
Update location of sclang as per previous commit.
Plastique no longer exists, the flagship theme is now fusion.