[dbus] another sync() wrapper

To synchronously execute function on value returned by d-bus call and
report error and return false on call failed. So, failure will not throw
exception

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
do not allow exception to go up to Qt

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[mce] initial provider version

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
mce package, removing -common

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