Fix set editor state for SSR

• Now editor state is correctly set on component load (useful when loading default content for server side rendering)

Add focus event

• Expose 'focus' event when referencing the MUIRichTextEditor component.

Enhance callback custom control

• The callback custom control now can fully replace the current EditorState when returning a value.
• Add id property to the MUIRichTextEditor component.

Add custom component feature

• The custom control component in the toolbar can be any component (before only IconButton was allowed)

Update TypeScript compiler configuration

• Add noUnusedParameters to compiler configuration
• Update examples

Disable toolbar when readOnly is set

• When readOnly property is true, the toolbar is disabled by default instead of hidden. It is still possible to set toolbar false to hide it.
• Fix a bug when inserting an image between lines.

Add custom atomic blocks

• User can define atomic blocks with custom data. See this for more details.
• Refactor MUIRichTextEditor code

Add video control

• Rename image control to media
• Add video control
• Merge image and video controls intro media
• Reduce EditorControls component properties

Add alignment controls for images

• Add alignment controls for image blocks
• Refactor properties for 'UrlPopover' component

Enhance input and edit for image/link entities

• Add focus and click event to edit images
• Add delete button to easily remove a link/image from the popover