#132 Search functionality for the command history

[DanielAjoy]

After having run a bunch of commands and having obtained partial results in the Command windows, it is sometimes hard to find pieces of code there, by manual inspection. A search feature that allows for the user to enter some text and be position where that text is found in the Command History would be useful.

I would personally prefer for the search to start from the most recent to the older entries by default. Case insensitive by default.