xolox#misc#escape#shell and noshellslash

[Taverius]

Was trying to figure out why custom languages were breaking in easytags - turns out noshellslash makes shellescape('-t-') output "-t-", which obviously breaks all custom stuff, and I suspect anything that uses xolox#misc#escape#shell

This might be new as of vim 8?

I'm (pretty) sure it was working in my old 7 install, though admittedly its been a while since I used that particular functionality.