~xigoi/matext

Fixed shorthands for blackboard bold letters
Fixed issues with whitespace
Extensible arrows
Preparation for proper handling of Greek letters
Fixed situation with newlines
Tests for mathrm
Merge branch 'master' of git.sr.ht:~xigoi/matext
Merge branch 'master' of git.sr.ht:~xigoi/matext
Give up GitHub
Improved build script
Made matext usable as a Nim library when compiling to JS
Updated site to newer xidoc
Clerified one-line mode on website
Re-added build status to README
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