Feature: file blacklist

[dxlr8r]

First, thanks for an excellent project!

As the title says, I would like to see a blacklist function in the application. My primary goal for this is to hinder pollution of the filesystem and repositories, in regards to various garbage different OS-s leave behind, like macOS's infamous .DS_Store and ._* files.

I have experimented with the code, and got a proof of concept working. So this issue is more a request if you want this feature, then I can improve my PoC and request a merge.

[dxlr8r]

#55