Support incoming args for changeIcon & changeColor terminal commands

[AdrieanKhisbe]

This Pull request permit the passing of args to the changeIcon/changeColor terminal commands.

This way, it’s possible to control icon and color of the terminal tab, from the terminal itself using remote-control extension.

Currently, trying to do so would trigger the prompt to pop up even with a specified arg, as the args are not forwarded.

I tested locally this PR code by adding the remote control extension to the extensions , and by running the provided command from a fresh terminal. (websocat was installed from brew on a macbook)

I might need some guidance if automated test are to be added, or existing one adapted.

Preview

echo "{ \"command\": \"workbench.action.terminal.changeIcon\", \"args\": \"lightbulb\" }\n{ \"command\": \"workbench.action.terminal.changeColor\", \"args\": [\"terminal.ansiYellow\", false] }" \
    | websocat ws://localhost:$REMOTE_CONTROL_PORT

before	after

[AdrieanKhisbe]

Feel free to contact me @joyceerhl if ever you need some help for guidance, or if ever intent of PR needs clarifications.
I just updated base, and improved a bit the original PR description.

:)