Update vitreum (#946)

- Updates Vitreum to v6.0.1 + some custom fixes.
  - Stylesheets must be imported with `require('./sheet.less');` but can also can now share stylesheets between jsx components.
  - Should eliminate a lot of security concerns with older nested dependencies.
  - Changed a lot of files to make this work
- Also removes dependency on PicoRouter in favor of React-Router

shared/naturalcrit/nav/nav.less

@@ -1,3 +1,4 @@
+//@import (less) 'naturalcrit/styles/style.fonts.css';
 nav{
 	background-color : #333;
 	.navContent{
@@ -77,4 +78,4 @@ nav{
 	.navSection:last-child .navItem{
 		border-left : 1px solid #666;
 	}
-}
+}