[MM-18152] Desktop notifications (#1040)

* temp

* add in html5 notification tests

* strip out custom permissions handling

* disable middle click

* validate as URI instead of URL

allow’s custom protocol’s to pass through

* add context isolation to new window requests

* add new permissions handling

* prevent setting user to away from quit/shutdown

* dispatch desktop notifications from renderer

* remove test code

* log desktop notification errors

* should deny as a last resort

* only trigger callback once

electron-builder.json

@@ -3,7 +3,7 @@
     "provider": "generic",
     "url": "https://releases.mattermost.com/desktop/"
   }],
-  "appId": "com.mattermost.desktop",
+  "appId": "Mattermost.Desktop",
   "artifactName": "${name}-${version}-${os}-${arch}.${ext}",
   "directories": {
     "buildResources": "resources",