Previously each vline (visual line) had a full copy of its associated string, this changes it so it only slices a part of the parent line. Reduces significantly the memory usage. This actually worsen the emojify-link glitch reported by Freezr after the some recent refactoring in the wrapping code. Not a big deal since I'm about to restructure the whole rendering bit by bit (hopefully!)

temporary band-aid until i find the time to rewrite this stuff...

was forgotten during import because of the .gitignore. Reported by Freezr, thank you!

while here collect the links at the end.

unlike the previous hack, libgrapheme is UNICODE 15.0 compliant (at the time of writing) and provides some nice API. While here, drop the hard wrap method for preformatted blocks: always use the normal wrapping. Since libgrapheme is not yet widely available, future commits will probably add a bundled version to ease packaging. I'll also start to replace various home-grown UNICODE/utf8 handling routines with functions from libgrapheme.

- be more like the kamid site: generate the HTML from a mixture of text/gemini and (bits of) html. - include the awesome logo by freezr - use (a modified version of) kamid' style.css - use mandoc.css - minor styling tweaks