Make plugin importable

Don't start the web server if imported not from inside Anki

Make sure Anki Connect instance is not garbage collected.
This kills the timer that's responsible for the web server.

plugin/__init__.py

@@ -58,14 +58,19 @@ class AnkiConnect:
 
     def __init__(self):
         self.log = None
+        self.timer = None
+        self.server = web.WebServer(self.handler)
+
+    def initLogging(self):
         logPath = util.setting('apiLogPath')
         if logPath is not None:
             self.log = open(logPath, 'w')
 
+    def startWebServer(self):
         try:
-            self.server = web.WebServer(self.handler)
             self.server.listen()
 
+            # only keep reference to prevent garbage collection
             self.timer = QTimer()
             self.timer.timeout.connect(self.advance)
             self.timer.start(util.setting('apiPollInterval'))
@@ -1698,4 +1703,9 @@ class AnkiConnect:
 # Entry
 #
 
-ac = AnkiConnect()
+# when run inside Anki, `__name__` would be either numeric,
+# or, if installed via `link.sh`, `AnkiConnectDev`
+if __name__ != "plugin":
+    ac = AnkiConnect()
+    ac.initLogging()
+    ac.startWebServer()