GUI Improvement to allow manual search

[volker76]

reopen individial issues from #15

under Tuya Devices -> Scanned network devices:

add a button to manually search for new devices (in my case new devices do not show automatically in the overview)
add the device name for easier identification of the device

[volker76]

this does not work as suggested. The listed devices are results of received broadcast messages.
in case the device does not broadcast or the broadcast is not received due to network restrictions (e.g. docker encapsulation) this does not receive anything.