Allow pasting multiple lines in the Python Console

[LeonarddeR]

Is your feature request related to a problem? Please describe.

It is currently impossible to paste more than one line in the python console. It would be handy if this could be possible, as it will make copying and testing code from the console easier.

Describe the solution you'd like

I think we should make the input control multi line as well, however it should of course keep the navigable history feature.

[JulienCochuyt]

On my own Python console tweaking addon, I kept the field single line but added support to paste multiple lines like in a regular Python console.
I could prepare a PR out of it if you like.

Btw, other tweaks I use that one might find handy:

• Preserve the underscore variable that stores the result of the last execution, while keeping the global gettext untouched.
• Key bindings in the output pane to jump to next/previous result.

[LeonarddeR]

Wow, I think these things are certainly handy to be in core. So if you could file a pr for them, I'd be pretty interested.