Code improvements v2.0

[Sigura]

• [x] remove babel-node using to start node with @babel/register
• [x] review flow checking
• [ ] fix eslint checking and add it to pre-commit
• [ ] fix eslint warnings
• [ ] fix any type using in .flow
• [ ] Divide huge components to separate function components (like Viewport, FilterView)
• [ ] React 17 features