Allow property sections to match folders

We generally lookup include/exclude patterns for a folder rather than a file, and here it makes sense to allow the bracketed sections of the property files to target the folder.

Since the sections are not ranked based on how good a match they are, targeting a subfolder, and then a subfolder of this subfolder, does not have which settings take precedence defined.
Exclude bin/CxxTest from ⌘T and ⇧⌘F