* feat: add support for cmd
* add preprompt and precmd support
* add keymap support
* add info about minimum Clink version
* simplify escaping
* add handling for cmd custom commands
* add support for transient_prompt and transient_rprompt
* Revert 914057952508e81e20086fcb707ba2a0be85fdd3
This reverts commit "add support for transient_prompt and transient_rprompt"
* Apply suggestions from code review
* disable cmd shell custom commands
* any shell other than cmd can be used
* better error and correct script location
* move shell check in `map_no_escaping`