Migrate to Unibeautify as core

[Glavin001]

See https://github.com/Unibeautify/unibeautify

Features:

• Completely rewritten in TypeScript which is then compiled to JavaScript
  • Faster and cleaner implementation, taking into consideration all that we have learned from Atom-Beautify.
  • Will be easier to contribute to with TypeScript aiding our development and ensuring there are less mistakes in the code
• Separate beautifier packages from core #620 - Separate Beautifiers from Atom-Beautify / Unibeautify
  • Users will install only the beautifiers they need. This will heavily reduce installation time and installation folder size of Atom-Beautify.
• Multiple active beautifiers per language #457 - Multiple active beautifiers
  • See Beautifier Pipeline: Multiple/cascading beautifiers per language Unibeautify/unibeautify#4
• Dynamic beautifier per project #1041 - Dynamic beautifier(s) per project
  • See Beautifier Pipeline: Multiple/cascading beautifiers per language Unibeautify/unibeautify#4
• More powerful third-party options importing support with https://github.com/Unibeautify/unibeautify-options-importer
  • Ex: Add importer linter-jscs #286 import Atom's linter-jscs options: Import linter-jscs Unibeautify/options-importer#2