Allow for Symbols as well as Strings for .signal_connect()

[rubyFeedback]

Hey there,

Would it be possible to support:

button.signal_connect(:clicked) { win.destroy }

in addition to:

button.signal_connect('clicked') { win.destroy }

?

So both string, or symbol for signal connect as
argument. The symbol could be converted internally
in whatever code handles the signal-connect
situation. (I don't know how the gir bindings work,
whether you can make such modifications or
not.)

ruby-gtk3 allows both and I use the symbol variant,
since I can omit the trailing '

It is not important, but if it is of no bother to you or
the project here then I think I would like to be able
to use it. It may lead to less uniform downstream
code, so there is a trade-off, but personally I love
symbols for several reasons. Anyway it is just
a suggestion, it is your project so you are making
the decisions which is totally fine. Thank you for
reading!

[mvz]

This could be nice since the resulting code will look better. One thing to take into account is that signal names use dashes to separate words. In symbols, underscores should probably be supported as an alternative.