up to v3.0.0d

update to version 2.2.7d

Forgot to tag the v2maint source for v2.2.7c?

up to v 3.0.0a

#ifdef out more of the typora-specific code

v2.2.7; bugfix for label generation

mkd2html wasn't properly handling two arguments for input & output fi…

…les. While I was at it, add the -G option to use gfm_in() to read the input file in (and preserve newlines)

push the fencedcode block handler up to the toplevel scanner so it wi…

…ll handle blank lines inside the fence

Version 2.2.4; also when doing github checkbox as input form disable …

…each checkbox

use __remove to remove the executables after the S_ISxxx tests so it …

…will clean up macos .dSYM poop