!!! User defined autocomplete

Usage: !!![-*][cmd] [arg|$type...] # user-defined autocompletion for commands

• !!! list all autocompletions
• !!!: Register new autocomplete logic
• !!!? show this help
• !!!-* remove all user-defined autocompletions
• !!!-\* remove autocompletions starting by backslash (glob expression)
• !!!-foo remove autocompletion named 'foo'
• !!!foo add 'foo' for autocompletion
• !!!bar $flag add 'bar' for autocompletion with $flag as argument

|Types:
| $dflt     default autocomplete flag
| $flag     shows known flag hints
| $flsp     shows known flag-spaces hints
| $zign     shows known zignatures hints
| $eval     shows known evals hints
| $prjt     shows known projects hints
| $brkp     shows known breakpoints hints
| $file     hints file paths
| $thme     shows known themes hints
| $optn     allows the selection for multiple options