reply processing callback is optional in sendMessage()

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
correct setup of cwd for actor

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
fix in actor error processing

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
qtscript: fullscreen declarative ui

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