This will be useful if we decide to ship lntransport as a separate
package. It is also a conceptual cleanup.
Notes:
- lntransport still requires crypto.py
- parsing node id from a bolt11 invoice is not supported.
There is an issue with plyer on Windows, which I thought was related to the mixed
backwards/forward slashes in the path, but no, this change still did not fix it:
```
1.84 | D | gui.qml.qeapp.QEAppController | sending push notification to OS: message='heyheyhey'
Traceback (most recent call last):
File "...\electrum\electrum\util.py", line 1111, in run_with_except_hook
run_original(*args2, **kwargs2)
File "...\Python310\lib\threading.py", line 953, in run
self._target(*self._args, **self._kwargs)
File "...\plyer\platforms\win\libs\balloontip.py", line 206, in balloon_tip
WindowsBalloonTip(**kwargs)
File "...\plyer\platforms\win\libs\balloontip.py", line 130, in __init__
raise Exception('Could not load icon {}'.format(app_icon))
Exception: Could not load icon ...\electrum\electrum\gui\icons\electrum.png
```
- wallet.get_receiving_addresses is guaranteed to exist (maybe it was only for HD wallets in the past)
- wallet.is_mine is stricter than wallet.adb.is_mine, usually we want the former
In some cases this makes it much easier to successfully scan a QR code.
I was trying to scan a PSBT using a laptop camera from my phone screen for 2 minutes, until I realised the screen brightness was the issue. o.O
instead, schedule a queued finished signal to unregister the listener after the handler has finished.
See PythonActivity.java in P4A for why this probably causes the most often occurring crash we see on the Play Store:
```
Exception java.lang.RuntimeException:
at android.app.ActivityThread.deliverResults (ActivityThread.java:5164)
at android.app.ActivityThread.handleSendResult (ActivityThread.java:5205)
at android.app.servertransaction.ActivityResultItem.execute (ActivityResultItem.java:51)
at android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2136)
at android.os.Handler.dispatchMessage (Handler.java:106)
at android.os.Looper.loop (Looper.java:236)
at android.app.ActivityThread.main (ActivityThread.java:8061)
at java.lang.reflect.Method.invoke
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:656)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:967)
Caused by java.util.ConcurrentModificationException:
at java.util.ArrayList$Itr.next (ArrayList.java:860)
at org.kivy.android.PythonActivity.onActivityResult (PythonActivity.java:218)
at android.app.Activity.dispatchActivityResult (Activity.java:8501)
at android.app.ActivityThread.deliverResults (ActivityThread.java:5157)
```
