Merge branch 'ds/include-exclude'

The internal code originally invented for ".gitignore" processing got reshuffled and renamed to make it less tied to "excluding" and stress more that it is about "matching", as it has been reused for things like sparse checkout specification that want to check if a path is "included". * ds/include-exclude: unpack-trees: rename 'is_excluded_from_list()' treewide: rename 'exclude' methods to 'pattern' treewide: rename 'EXCL_FLAG_' to 'PATTERN_FLAG_' treewide: rename 'struct exclude_list' to 'struct pattern_list' treewide: rename 'struct exclude' to 'struct path_pattern'