Improve bookmarks

[zxdong262]

Thank you for your really good job.

I am using a licensed instance of Royal TSX and I am migrating to Electerm.

I have some ideas for bookmark:

1. Unlimited inherited folders, or more than 2. If unlimited is not possible, 10 levels could be enough :-)
2. Notes as new type of bookmark element. Could be useful when you want to add some documentation to a bookmark folder
3. Option of remove type os connection in title. In web shows "[web]" in local "[local]" but in ssh it not shows nothing, so the option of you can hide "[web]", "[local]", ... from the title bookmark like ssh.
4. New VNC type

Thank you, very much.

Originally posted by @joganaz in #3429