[api] use server interface to request reload

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[bridge] reregister provider on statefs restart

Workaround to allow bridge to be reregistered on contextkit
configuration changes

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[cmake] no Qt5Core_EXECUTABLE_COMPILE_FLAGS

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