Add async custom blocks feature

• Now is possible to add custom blocks when resolving a promise using the added insertAtomicBlockAsync API.
• ⚠️Deprecated value property. Use defaultValue instead.
• ⚠️Deprecated insertAtomicBlock reference function. Use insertAtomicBlockSync instead.
• Add example on how to upload an image within the editor.
• Add example on how to insert async atomic custom blocks.

Further refactoring

• Rename properties.
• Add explicit TMUIRichTextEditorRef reference type for the MUIRichTextEditor component.
• Remove unneeded trailing punctuation.
• Update README

Fix clear custom styles bug

• Fix a bug that prevented clearing custom defined inline styles when using the Clear control

Refactoring

• Small code refactoring (no logic changed from last version)

Enable atomic components with autocomplete

• Enables using atomic components defined in custom controls for inserting autocomplete suggestions to the editor.

Enable any component on autocomplete suggestion list

• Previously only text was allowed on the autocomplete suggestion list. See this example for more.
• Fix a forced unwrap when checking the key binding function.

Insert autocomplete suggestion as entity

• Selecting an autocomplete suggestion now inserts an entity instead of plain text.
• Small refactor on Link component.

Add autocomplete strategies feature

• Add autocomplete feature, to enable users to create suggestion lists based on input text. See more on the README file. This feature was suggested in #103.

Remove spacing legacy code

Removed fallback behavior code that simulated the spacing function introduced in material-ui v4. The material-ui v3 is no longer supported for this package since previous versions.

Fix clear function

Fix a bug that did not clear inline styles when the selection began with a clear inline style. Issue mentioned in #91