New release 3.28

-added support of Pascal, Lua, Ruby and C# regions in outhtml_codefold.lua
-improved outhtml_codefold.lua to handle embedded languages
-added string delimiters in the Ruby definition
-added new AssertEqualLength flag in string section of language definitions
-improved heredoc parsing
-fixed Lua multiline string recognition
-improved SVG whitespace output
-added Nim and mIRC Scripting definitions