Swift5 with minor optimization

• Swift 5 version
• Enabled indexing name without extensions

Renamed FilterOptions

Renamed FilterOptions to match with FileManager.enumerate.options

Reconstructed TonnerreIndex

• Separation of create and open in TonnerreIndex
• Bug-free memory management
• No longer restrict index for metadata or nameOnly
• Updated README

Support filtering for events

• Support filtering file-system events
• Enable close index

Replaced some enums with OptionSet

• A better api design by replacing some enum arrays with option set

Bug fixing

• Fixed the bug in the contains(_ element: Element)
• Fixed the detection of inside package changes

New constructors for TonnerreFSDetector

• New constructors with URLs for TonnerreFSDetector
• Add the contains function in Array

Remove files' extensions

• Removed files' extensions to narrow down searches
• Better API

Support non-Latin languages

• Indexing process will automatically include the latin spelling of the original language, and the search function can pick them out with latin spells
  • e.g. "文件" can be found by either "文件" or "wen jian"

Minor api change

Changed defaultOption to default. Renamed the schema