Help Prolific refugees to understand their hostage situation

This attempts to warn Windows users who have had their devices
poisoned by the Prolific driver heist of the problem and the
workaround. Hopefully this will prevent users from opening bugs
thinking that CHIRP is at fault.

Related to #11552

chirp/wxui/clone.py

@@ -19,6 +19,7 @@
 import re
 import textwrap
 import threading
+import webbrowser
 
 import serial
 from serial.tools import list_ports
@@ -40,6 +41,10 @@
 CUSTOM = _('Custom...')
 
 
+def is_prolific_warning(string):
+    return 'PL2303' in string and 'CONTACT YOUR SUPPLIER' in string
+
+
 def get_fakes():
     return {
         'Fake NOP': developer.FakeSerial(),
@@ -468,6 +473,18 @@ def _port_assist(self, event):
             return
         self.set_ports(after, select=found.device)
 
+    def _prolific_assist(self, event):
+        r = wx.MessageBox(
+            _('Your Prolific-based USB device will not work without '
+              'reverting to an older version of the driver. Visit the '
+              'CHIRP website to read more about how to resolve this?'),
+            _('Prolific USB device'),
+            style=wx.YES | wx.NO | wx.YES_DEFAULT, parent=self)
+        if r == wx.YES:
+            webbrowser.open(
+                'https://chirpmyradio.com/projects/chirp/wiki/'
+                'ProlificDriverDeprecation')
+
     def _add_aliases(self, rclass):
         for alias in rclass.ALIASES:
             class DynamicRadioAlias(rclass):
@@ -490,6 +507,7 @@ def _persist_choices(self):
         raise NotImplementedError()
 
     def _selected_port(self, event):
+        okay_btn = self.FindWindowById(self.GetAffirmativeId())
         if self._port.GetStringSelection() == CUSTOM:
             port = wx.GetTextFromUser(_('Enter custom port:'),
                                       _('Custom Port'),
@@ -501,7 +519,12 @@ def _selected_port(self, event):
         elif self._port.GetStringSelection() == HELPME:
             self._port_assist(event)
             return
+        elif is_prolific_warning(self._port.GetStringSelection()):
+            self._prolific_assist(event)
+            okay_btn.Enable(False)
+            return
         self._persist_choices()
+        okay_btn.Enable(True)
 
     def _select_vendor(self, vendor):
         display_models = []