* progress on overhaul
* finish scrutinization of languages existing in old colors file
* remove markdown code block highlight due to broken upstream syntax
* add user config globals
* update issue and pull request templates
* small fixes
* fix "illegal value" error when using overrides
* actually fix the attribute filter this time
* add git commit diff colors. closes#46
* remove unnecessary duplicate
* set SignColumn explicitly
* Add a helpfile (#64)
* Ignore the tags file generated by :helptags
* Write the help file
