Add a variant of expose that does not steal focus

[idanarye]

ChannelotTerminal:expose() opens the terminal in a new split - which switches focus to it - and also enters insert mode. This is useful because it allows the user to easily close the terminal, but sometimes we want to just display the terminal without snatching the cursor from the user.

I want to add a new method, that opens the terminal window in a new split:

• Without going into insert mode.
• Without switching focus to that split (which probably means switching focus back to the original window)