Added Night Coder theme with 4 variants, Paper theme and Ice theme

[a5hk]

Changes

Added three theme:

• Night Coder (4 variants):
  • Night Coder Ash
  • Night Coder Charcoal
  • Night Coder Ember
  • Night Coder Flame
• Paper
• Ice

Screenshots

Night Coder Ash:

Night Coder Charcoal:

Night Coder Ember:

Night Coder Flame:

Paper:

Ice:

Checklist

• Added markup tests, or they don't apply here because...
• Updated the changelog at CHANGES.md

[joshgoebel]

Please remove the last commit and all the changes to changes. We just need the actual two lines to add what changed and the footnote.

[a5hk]

I rebased the code and made a single commit.