Add Settings window to Agent UI

Agent systray UI has been extended with
a setting window that allows configuring 
management URL, admin URL and 
supports pre-shared key.
While for the Netbird managed version 
the Settings are not necessary, it helps
to properly configure the self-hosted version.

.gitignore

@@ -1,10 +1,11 @@
 .idea
 *.iml
 dist/
+bin/
 .env
 conf.json
 http-cmds.sh
 infrastructure_files/management.json
 infrastructure_files/docker-compose.yml
 *.syso
-client/.distfiles/
+client/.distfiles/