lnaddr: rename LnAddr -> bolt11

The LnAddr, lndecode and lnencode naming didn't imply that it is
bolt 11 specific, making it confusing to work with, now that there are
also bolt 12 "lnaddr".
Renaming it to *bolt11* creates a clear separation to bolt 12 things and
reduces mental load.

This commit is pure renaming (using the PyCharm IDE refactor function),
except for the removal of the `object` inheritance of LnAddr/BOLT11Addr,
this is Python 2 legacy.

electrum/gui/qt/main_window.py

@@ -73,7 +73,7 @@ from electrum.exchange_rate import FxThread
 from electrum.simple_config import SimpleConfig
 from electrum.logging import Logger
 from electrum.lntransport import extract_nodeid, ConnStringFormatError
-from electrum.lnaddr import lndecode, LnAddr
+from electrum.bolt11 import decode_bolt11_invoice, BOLT11Addr
 from electrum.submarine_swaps import SwapServerTransport, NostrTransport
 from electrum.fee_policy import FeePolicy
 
@@ -1678,7 +1678,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
 
     def show_lightning_invoice(self, invoice: Invoice):
         from electrum.util import format_short_id
-        lnaddr = lndecode(invoice.lightning_invoice)
+        lnaddr = decode_bolt11_invoice(invoice.lightning_invoice)
         d = WindowModalDialog(self, _("Lightning Invoice"))
         vbox = QVBoxLayout(d)
         grid = QGridLayout()
@@ -1713,7 +1713,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
         grid.addWidget(QLabel(_('Text') + ':'), 8, 0)
         grid.addWidget(invoice_e, 8, 1)
         r_tags = lnaddr.get_routing_info('r')
-        r_tags = '\n'.join(repr(r) for r in LnAddr.format_bolt11_routing_info_as_human_readable(r_tags))
+        r_tags = '\n'.join(repr(r) for r in BOLT11Addr.format_bolt11_routing_info_as_human_readable(r_tags))
         routing_e = QTextEdit(str(r_tags))
         routing_e.setReadOnly(True)
         grid.addWidget(QLabel(_("Routing Hints") + ':'), 9, 0)