reverse out changes make for issue 574

fix kevinlawler#581: \\[cmd] fails

fix kevinlawler#536: Loading and Saving a text file

minor notation fix

Merge pull request kevinlawler#541 from Crestwave/haiku

Add support for Haiku

update Windows version

fix for build using MINGW-10.0 with msys2

fix for build using MINGW-10.0 with msys2

remove some duplicate code

remove comment that no longer applies