Feature Request: List all available registers and options

[lammermann]

I have the following use case: Often I would like to get a register or an option with kcr get ... but I can't remember the name of that register/option. Than it would be nice to have a command that fetches a list of all available options/registers. This could be used with fzf easily to browse the available options/registers.

Would you consider adding such a feature?

Btw thanks for this great tool.