Add new themes

[TaffarelJr]

Add new themes as additional options:

• Monokai
  • https://monokai.nl/attic/textmate/Monokai.tmTheme
  • https://monokai.pro/vscode
• Base16 options
  • https://github.com/chriskempson/base16
  • https://marketplace.visualstudio.com/items?itemName=AndrsDC.base16-themes
  • https://marketplace.visualstudio.com/items?itemName=golf1052.base16-generator
• Tomorrow
  • https://github.com/chriskempson/tomorrow-theme
• Dracula
  • https://draculatheme.com/
  • https://draculatheme.com/pro
• Rainglow
  • https://marketplace.visualstudio.com/items?itemName=daylerees.rainglow

[TaffarelJr]

Additional ideas:

• Calculate lighter/darker hex colors to dynamically set shades in some applications of a theme
  • https://www.sitepoint.com/javascript-generate-lighter-darker-color/ (Port to PowerShell)
• Match Windows theme & Accent Palette to the selected theme
  • https://winaero.com/windows-10-different-own-color-for-taskbar/
  • https://www.tenforums.com/customization/134313-how-do-i-change-refresh-accentcolor-via-command-line.html
  • https://www.tenforums.com/tutorials/3380-change-accent-color-windows-10-a.html
  • https://github.com/Raymai97/AccentPaletteTool