Add a command to navigate to the source of any command

[tbpassin]

Buttons added by the "Script Button" button have a context menu item to navigate to their defining script. This is very useful. I suggest that it would be equally useful to have a command that would navigate to the source of any minibuffer command. It would work much like the F11 command, but instead of displaying the command's docstring it would navigate to the actual script.

[edreamleo]

@tbpassin Great idea.

[edreamleo]

@tbpassin Still a great idea, but doing it will be a bit clumsy. With @button nodes the user just right-clicks the button. But to find the source of any command the user must specify the command, presumably in the minibuffer, with typing completion.

So is the command worthwhile? Yes, because the command should search all the open .leo files, plus myLeoSettings.leo and leoSettings.leo.

[tbpassin]

I see it as working like the F11 command - you get tab completion to zero in on the right command.

I think the @button buttons can actually open the source outline, too (not 100% sure, but if they use the full UNL it would work that way).