Redesign LIA and making it easier to maintain

[pharesdiego]

package.json

• Adds the command npm run prettier to format LIA's code with best practices.
• Adds jrewind as dependency.

• Deletes unused dependencies.

  Components

• Adds Rewinder to control session's code.
• Improves readability of some components.

• react-monaco-editor is completely replaced by react-codemirror2 as main editor.

  Styles

• Improves Material UI Theme.
• No need for react-grid-layout, everything is done with flex-box.
• client/index.css adds cross browser's [input=range] styles.

• Redesigns LIA's UI/UX.

  Overview

• No critical warning are displayed.
• Doesn't crash when pressing buttons.
• The session can now be recorded by jrewind.
• Still needs some performance improvements because many components re-render even though their props don't change.