#503 Honor .gitignore files on a per directory basis

[Gerhard Pobinger]

With git becoming more and more common, it would be a great feature for grepwin to be able to honor the contents of ".gitignore" files on a per subdirectory basis. That is when searching witin a directory tree, grepwin should be able to open a file within the current directory (e.g. ".gitignore"), parse its contents, and ignore the specified file patterns in its search when recursively descending further into the directory structure, and recursevely repeat that process for every directory that grepwin searches...