v2.28.0-rc.2

• Improvement - Performance optimizations: initialization speed increased, blocks.render() API method optimized. Big documents will be displayed faster.
• New - The blocks.insertMany() API method added. It allows to insert several Blocks to specified index.
• Improvement - Initialization Loader has been removed.
• Improvement - Selection style won't override your custom style for ::selection outside the editor.
• Improvement - "Editor saving" log removed
• Improvement - "I'm ready" log removed
• Improvement - The stub-block style simplified.
• Improvement - If some Block's tool will throw an error during construction, we will show Stub block instead of skipping it during render
• Improvement - Call of blocks.clear() now will trigger onChange with "block-removed" event for all removed blocks.