Latest MuPDF update changed HTML parsing, and use a better
HTML5 parser, which may cause some issues with the XHTML
we get from crengine.
So, for footnote popups, be sure we use MuPDF's XHTML parser.
Devices with a single target might want to specify it in `Device.ota_model`
Devices with multiple targets want to override the function or to specify `ota_model` variants for each target.
* Kindle: Implement a NetworkMgr backend loosely based on WpaClient in order to allow feature-parity with hasWifiManager platforms. This involves dealing with the native wifid over lipc (the native IPC system, based on DBus), through custom Lua bindings (https://github.com/notmarek/openlipclua), since the stock ones lack support for the needed hasharray data type.
* NetworkMgr: Clear up leftover hallucinations from #10669, making `enableWifi` much simpler (and much more similar to `turnOnWifiAndWaitForConnection`).
* NetworkMgr: Made it clearer that `turnOnWifi` implementations *must* deal with `complete_callback`, as part of the aforementioned changes mean that it's *always* wrapped in a connectivity check, and we need that for proper event signaling.
* Android, Emu: Run `complete_callback` properly in `turnOnWifi`.
* Kindle: Support `powerd:isCharged()` on the PW2 (yes, this is random, it just happened to be my test device :D).
* NetworkMgr:disableWifi: Properly tear down any potential ongoing connection attempt (e.g., connectivity check).
* NetworkMgr:promptWifi: Make the "wifi enabled but not connected" popup clearer if there's an ongoing connection attempt, and gray out the "Connect" button in this case (as it would only lead to another "connection already in progress" popup anyway).
* NetworkMgr:reconnectOrShowNetworkMenu: Make *total* scanning failures fatal (they will lead to an immediate wifi teardown).
* NetworkMgr:reconnectOrShowNetworkMenu: Clear up the long-press behavior (which *always* shows the network list popup) so that it doesn't weirdly break all the things (technical term!).
* NetworkMgr:reconnectOrShowNetworkMenu: When we manage to connect to a preferred network on our own *before* showing the network list, make sure it is flagged as "connected" in said list.
* NetworkMgr:reconnectOrShowNetworkMenu: Make connection failures fatal in non-interactive workflows (they'll lead to a wifi teardown).
* NetworkSetting (the aforementioned network list widget): Clear NetworkMgr's "connection pending" flag on dismiss when nothing else will (i.e., when there's no connectivity check ticking).
