1.0.0+kodimov.13: updates don't stop live TV; IPTV Simple restarts only when idle

- After an add-on update the new service found port 57031 still held by the
  old proxy for a moment and moved to a random port; the stream playing kept
  asking 57031 for its manifest and died a minute later (.49, 2026-11-13).
  The proxy now waits up to 10 s for the port, and SO_REUSEADDR /
  allow_reuse_address are set before binding (upstream set them after, so
  they did nothing).
- IPTV Simple is restarted only when nothing plays and no key was pressed
  for 30 s: on .49 a channel opened during a restart failed with an error.
- After start or update, changed instance files (duplicate removed, refresh
  timer) are picked up by the guide reload instead of a restart of their
  own; the service restarts IPTV Simple itself only if that reload didn't
  happen within 10 minutes. 3 restarts after kodimov.12 -> 2.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -18,7 +18,8 @@ What it adds:
 - **Gets along with Radios de Vigo** (`service.radios.vigo`), which keeps its own IPTV Simple instance for the Radio section. Kodi only lets *Use channel numbers from backend* be changed while it applies (one PVR instance loaded, or several and *always* on), so with a second instance it had refused the setting. Both add-ons now check it every so often: if it is hidden they turn *always* on, and they turn the setting itself on once; neither ever turns anything off, and turning it off by hand afterwards is respected. They also take turns to restart IPTV Simple, through the `pvr.iptvsimple.restarting` property of Kodi's home window.
 - **One IPTV Simple instance per channel list**: the TV guide setup rewrites the instance that already reads KodiMov+'s list (one set up with the original add-on, or by hand) instead of adding `instance-settings-91.xml` next to it, and the service deletes any extra one at Kodi start (keeping the one that isn't 91, which holds what was watched): two of them showed every channel twice.
 - Fixes the programme guide export of upstream 1.0.0 (the amazon.tv guide is a flat list).
-- Its own proxy port (57031), so it can run next to the original.
+- Its own proxy port (57031), so it can run next to the original. After an update the new proxy waits for the old one to free the port instead of moving to a random one, so the channel being watched keeps playing (upstream sets `allow_reuse_address` and `SO_REUSEADDR` too late to take effect).
+- **Restarts IPTV Simple only while idle**: nothing playing and no key pressed for 30 seconds (a channel opened during a restart fails). After start or update a single guide reload also picks up changed instance files.
 
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