Add msg plugin

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NAME
     msg - technicolor message printer

SYNOPSIS
     msg [-sn] @<fg:bg> [style]<text>[style]

OPTIONS
     -s
         Do not separate arguments with spaces.
     -n
         Do not output a newline at the end of the message.

STYLES
     _text_                 Bold
     __text__               Underline
     ___text___             Bold and Underline
     /directory/            Directories
     [url]                  Links
     \n                     Line Break
     \t                     Tab Space

     @<fg:bg> fg=bg=RGB|RRGGBB|name|random
       RGB value can be any three to six hex digit or color name.
       e.g, @0fb, @tomato, @random, @error, @ok.

AUTHORS
     @bucaran (Jorge Bucaran)

v. 0.1.0

See #283 for more info.