QLColorCode

Original project: http://code.google.com/p/qlcolorcode/
Github repository: https://github.com/anthonygelibert/QLColorCode

Added or Modified part in this branch.

This code is tested on macOS Mojave(10.14.5, xcode 12.1) only. Because the purpose of this branch is to resolve weird icon thumbnail issue in macOS Mojave.

• Resolve weird thumbnail icon appearance in macOS Mojave

  Code for generating preview and thumbnail presentation part, I borrowed it from below repositories.
  QLSwift https://github.com/lexrus/QLSwift.git
  QLStephen https://github.com/whomwah/qlstephen.git

• Support Mojave Dark mode

  Setting the thumbnail color style when system dark mode is on (default is darkplus):

    defaults write org.n8gray.QLColorCode darkTheme darkplus
  

  Setting the thumbnail color style when system darkmode is off (default is edit-xcode):

    defaults write org.n8gray.QLColorCode lightTheme edit-xcode
  

• Remove unused framework references.

• Change preview window size

• Add support Crystal language (@crjaensch)