findProperty() utility

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
searching of files is performed in correct order

Search order for js file to be loaded is:
- cwd
- js file dir
- directories in qtscript modules path

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
setup js cwd on loading qml file

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