DocumentFileCompat

Add support for parentFile. See #5.

Full Changelog: https://github.com/ItzNotABug/DocumentFileCompat/compare/1.0.7...1.0.8

1. RawDocumentFile now only deletes the current file, previously it'd delete everything recursively via File.deleteRecursively.
2. Make ResolverCompat an object for quick method access.
3. Replace String with Uri in constructor. Similar to DocumentFile api.
4. Rewrite document creation, listing and other required internal logic.

Commits: 7377303...3c69792

• Dependency updates.
• Fix wrong Uri returned issue.

Added a DocumentFileCompat.count() method to get the children count.
This is useful if you only want to check the count & do not require the created DocumentFileCompats.

Other changes:

• Removed extension functions on Collection<DocumentFileCompat>.
  You can use DocumentFileCompat.listFiles() & perform relevant actions on the List.

Fixes a IllegalArgumentException: Invalid URI crash via ebef599c.

Fixes a critical bug in ResolverCompat where in the correct document id was not passed when creating a TreeDocumentFileCompat.

1. Fixes issue #3
2. Other misc. improvements, documentation fixes.

Fix SerializedFile not implementing Serializable.

Initial release to MavenCentral.