Adds get_files for powerful directory crawling.
Adds get_files for powerful directory crawling.

The get_files function allows for directory exclusion with the `exclude_dirs`
option, file filtering with the `include_regex` option, limitted recursion
with the `depth` option, and symlink control with the `follow_symlinks` option.

StoicLoofah/sc2reader,ggtracker/sc2reader,vlaufer/sc2reader,ggtracker/sc2reader,dsjoerg/sc2reader,dsjoerg/sc2reader,GraylinKim/sc2reader,StoicLoofah/sc2reader,vlaufer/sc2reader,GraylinKim/sc2reader