Add Io Language support

Includes syntax highlighting file for Io and Z_CLI.io (repl) from
original Io Language repo, that was modified to work correctly in
Windows.
Added newline at the end of file
Change uuid and name of syntax definition file

Changing the uuid and name of syntax definition file to avoid conflicts
with other Io Language syntax files.
Merge pull request #265 from WingedBeast/iolanguage

Add Io Language REPL