v0.1.8

• breaking: Introduced a new property in theme called tabs-active-highlight, default color is #ff00ff.
• breaking: Removed breadcrumb navigation.
• breaking: Introduced a new property in theme called bar, default color changed is #1b1a1a.
• breaking: CollapsedTab is now default for all platforms.
• Tab UI got some updates.
• Introduce navigation.hide-if-single property (Ref: #595).
• Performance update: Remove lock dependencies on render calls.
• Performance update: Render repeated styled fragments as one rect.
• Sugarloaf API has changed from Sugar primitives to Content.
• Fix: [editor] overshadow headerless parameters in default config. (Ref: #601)