* add lua function to highlight yanked region
* extract namespace, better naming, default values
* add default for event argument
* free timer
* factor out mark to position calculation
* d'oh
* make sure timer stops before callback (cf. luv example)
* factor out timer, more documentation
* fixup
* validate function argument for schedule
* fix block selection past eol
* correct handling of multibyte characters
* move arguments around, some cleanup
* move utility functions to vim.lua
* use anonymous namespaces, avoid local api
* rename function
* add test for schedule_fn
* fix indent
* turn hl-yank into proper (hightlight) module
* factor out position-to-region function
mark extraction now part of highlight.on_yank
* rename schedule_fn to defer_fn
* add test for vim.region
* todo: handle double-width characters
* remove debug printout
* do not shadow arguments
* defer also callable table
* whitespace change
* move highlight to vim/highlight.lua
* add documentation
* add @return documentation
* test: add check before vim.defer fires
* doc: fixup
