renamed QCoreAppWrapper src/hdr/class

put into separate namespace and avoid mixing name with QXxx, used by Qt

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
no "mangling changed" gcc note

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[bridge] use new provider api

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[bridge] use qt preloader provider

Qt preloader provider is creating thread with QCoreApplication loop and
loads statefs-contextkit provider after it. So, any Qt code using main
thread event loop should run correctly. Next step is to separate qt
preloader into universal provider to load any Qt-based provider

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>