[IDEA] Use site-specific icons for MCA instances / launches

[ChristopherSchultz]

If you manage more than one MC server using MCA, you'll often have multiple MCA instances open, each to a different server.

The window titles identify the remote server by connection URL, but:

1. The dock titles (at least on MacOS) only say "java"
2. The dock/tray/whatever icons are all the same

It would be nice to take the icon from connections.json and use that when launching that particular instance of MCA. If you really want to (i.e. branding), you could merge the icons for Mirth Connect and whatever the connection-icon is, so you can have party-parrot-Mirth or whatever.

Oh, and also fix the dock title as well.

These can be done by adding -Xdock:name and -Xdock:icon parameters to the JVM invocation.

[jonbartels]

Related discussion #5263 (comment)