use API token instead of password hash in pihole module

* with newer versions of pi-hole, it is not possible
  anymore to use the password hash for the API authentication.
  Instead, one needs to use the dedicated API token for that.
  In order to stay backwards compatible, and not break existing
  bumblebee_status setups, the 'pwhash' parameter is still supported
  (in case someone runs an outdated pi-hole version).

* the new pi-hole API endpoints do not allow to access the summary
  endpoint without an API token. So, therefore '&auth=<api token>' was
  added.

bumblebee_status/modules/contrib/pihole.py

@@ -4,13 +4,20 @@
 
 Parameters:
     * pihole.address     : pi-hole address (e.q: http://192.168.1.3)
+
+
+    * pihole.apitoken    : pi-hole API token (can be obtained in the pi-hole webinterface (Settings -> API)
+
+    OR (deprecated!)
+
     *  pihole.pwhash     : pi-hole webinterface password hash (can be obtained from the /etc/pihole/SetupVars.conf file)
 
+
 contributed by `bbernhard <https://github.com/bbernhard>`_ - many thanks!
 """
 
 import requests
-
+import logging
 import core.module
 import core.widget
 import core.input
@@ -22,7 +29,18 @@ class Module(core.module.Module):
         super().__init__(config, theme, core.widget.Widget(self.pihole_status))
 
         self._pihole_address = self.parameter("address", "")
-        self._pihole_pw_hash = self.parameter("pwhash", "")
+        pihole_pw_hash = self.parameter("pwhash", "")
+        pihole_api_token = self.parameter("apitoken", "")
+
+        self._pihole_secret = (
+            pihole_api_token if pihole_api_token != "" else pihole_pw_hash
+        )
+
+        if pihole_pw_hash != "":
+            logging.warn(
+                "pihole: The 'pwhash' parameter is deprecated - consider using the 'apitoken' parameter instead!"
+            )
+
         self._pihole_status = None
         self._ads_blocked_today = "-"
         self.update_pihole_status()
@@ -42,7 +60,11 @@ class Module(core.module.Module):
 
     def update_pihole_status(self):
         try:
-            data = requests.get(self._pihole_address + "/admin/api.php?summary").json()
+            data = requests.get(
+                self._pihole_address
+                + "/admin/api.php?summary&auth="
+                + self._pihole_secret
+            ).json()
             self._pihole_status = True if data["status"] == "enabled" else False
             self._ads_blocked_today = data["ads_blocked_today"]
         except Exception as e:
@@ -56,13 +78,13 @@ class Module(core.module.Module):
                     req = requests.get(
                         self._pihole_address
                         + "/admin/api.php?disable&auth="
-                        + self._pihole_pw_hash
+                        + self._pihole_secret
                     )
                 else:
                     req = requests.get(
                         self._pihole_address
                         + "/admin/api.php?enable&auth="
-                        + self._pihole_pw_hash
+                        + self._pihole_secret
                     )
                 if req is not None:
                     if req.status_code == 200: