Added Support for folder selection

Cleaned Up code.

• Mainly coding style

Added selection of single and multiple folders.
Enabled FileProvider name overriding

Android-8 Support. Bug Fixes. Translation support

• Added Support for Android-8 (API 27)
  Some bug fixes:
• Filtering fix (Files without extension are not shown)
• Updated dependencies
• Added Translation support and German Translation
• Crash fix in Nougat in FileChooser

Folder size lag fixed, properties display crash fix

Fixed lag when showing folder size and eventual crash
Fixed Properties display crash

Permission Fix for android versions < 6

Fixed grey screen and permission not granted toast issue for android versions < 6

Full featured initial release

• Fixed All Reported Bugs
• Added Initial Directory/File Filtering