Merge pull request #1 from AssureNote/collaboration

Collaboration
add auto-unfolding hitbox (dummy)
refactor animation
refactor layout engine
impl auto-expantion
Added Plugin.RenderHTML and VariableInterpolation.ts
Implement VariableInterpolation.RenderHTML
Implement GSNNode.GetTabMapWithLexicalScope
Enable Variable Interpolation
add function to highlight focused node