one of the editor windows instead of the file if it is open (possibly
dirty)

mark it as an error

* Homebrew installs vvp and gtkwave on /usr/local/bin, so current tool
* file failed because the path was not including this folder. Easier to
* add a config and allow custom vvp/gtkwave location.

implemented some parsing of the ISE output

Add support for OS X detection.