1.13.0 - Support for Umi wildcards

Adds support for https://github.com/Klokinator/Umi-AI, which uses a yaml-based tagging system for dynamic wildcard template selection.
Completion takes previous Umi tags into account to only show possible candidates, which allows progressive filtering to close in on wanted templates.

See #84, #88, #90, #93.

Thanks to @ctwrs for the help.