callout with and w/o abbr. titles

Bugfix

Hastily adding the possibility for using abbreviations in callout titles introduced a bug when callouts did not have a title. Thank you, @ChristopherBarrington, for reporting issue #2 and suggesting a fix. I extended the fix to callouts with empty bodies that were also affected.

v0.4.0 call out

Includes support for callouts, requires quarto 1.3
(fix issue #1 )

v0.3.0 find me, eat me

First official release: simple textmacros for quarto

Full Changelog: https://github.com/ute/search-replace/commits/v0.3.0