Add DASP device discovery to the connect dialog

Send DISCOVER broadcast (type 0) to 255.255.255.255 and the Sedona
multicast address 239.255.18.76 to find devices on the network.
Responses are listed in a Treeview showing IP and platform ID.
Selecting a device fills the Host field; double-click connects.
Wait time is configurable (default 10s, range 1-60s).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app_state.py

@@ -8,7 +8,7 @@ so later rebinding would only ever be seen by the module that did it.
 import configparser
 import os
 
-VERSION = "0.0.0.096"
+VERSION = "0.0.0.097"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True