Issues with Ctrl+Q to quit

Hi,

OK so I ran into an issue. I installed micro on my NAS, and when I ssh into the system from my computer's terminal, it works perfectly as expected.

However, all NAS programs are web-based, and when I access micro through the NAS's web-based terminal, and I press Ctrl+Q, firefox thinks that i'm trying to close the web page completely and it overrides micro's shortcut. As such, in this web-based terminal, there is no way to quit micro once it is opened.

One way to fix this would be to change the ctrl-q to ctrl-x as it is in nano, which doesn't interfere. The best solution, however, would probably be to implement some sort of way to override and customize the default action keys via command line so that each user could customize it to his own needs.

No files or tests are named in the issue. Start by reproducing Ctrl-Q in the reported web-based terminal, then inspect micro's existing keybinding and command-line configuration behavior. Done should mean users can quit micro in that environment and can override or customize the relevant action without interfering with the terminal or browser.