Custom cursor style support

[vaygr]

First of all, thanks a lot for this nice terminal emulator (I'm switching terminals and glad to find this excellent candidate).

Even though blinking is not on the roadmap, maybe implementing just different cursor style option could be a good start? Similarly to styles in this st patch: just block, bar and underline would be great.

[tomscii]

Thanks. Blinking is on the roadmap but is very much a non-essential feature so who knows when I will get to it... These customizability features are starting to cross into the land of full blown terminal emulators, the sky is the limit and there is practically no end to the ideas about what else to add. But to be honest, Zutty (or rather I as its author) has a rather minimalist perspective on what a terminal should implement, and that is, well, mostly already implemented... That said, I will consider your suggestion.