function-args.el (moo-implement-action): Improve

Add more aggressive caching to moo-jump-local

* function-args.el (moo-jump-local-cache): New defvar.
(moo-jump-local): Previously, the tag list would be generated by
appending all tag lists for all files. While all those were cached and
re-updated with the file change dates, simply appending them was a
costly operation. So now `moo-jump-local' assumes that no tags were
changed at all. If they were, use "C-u" `moo-jump-local' to regenerate
the changed files' tags.
(moo-select-candidate): Change `ivy-height' to 15.

function-args.el: set new version