Ability to add multiple files to the ignore list

[carleeto]

It would be nice to right click multiple files and add them to the ignore list.

This is handy when you have source files that are autogenerated but are not in their own folder. Therefore, you can't ignore the folder and you can't ignore the extension.

A great bonus would be to be able to edit the ignore lines before they are added (like GitBox), in case the ignore is a regular expression, for example.