Black sidebar, user preferences to hide/show folder arrows and change UI font to Source Code Pro.
Merge branch 'master' of https://github.com/amirrustam/haft-lang

# By Eivind Arvesen
# Via Amir Rustamzadeh (2) and Eivind Arvesen (1)
* 'master' of https://github.com/amirrustam/haft-lang:
  Removed black folder icons in sidebar, as per #4.
  Changed layer tints to rectify background color of tabs.