Clear the terminal history on command

[Tristan-H11]

Is your feature request related to a problem? Please describe.
At the moment you cannot clear the history of the terminal commands, you used.

Describe the solution you'd like
A new command clearHistory that takes no arguments and clears the history of the current session.
Description: "Clears the history of used commands in this terminal session."

Additional Comments
As far as I can see, this is done with just emptying the String-Array protocol in terminal-states.ts, because every attempt to use the history finally lands here. But please check again, if this alone can be it.

[Tristan-H11]

@MarcelCoding Assigne me please :)

[Tristan-H11]

See #306