Add Display plugin options
Add plugin specific options
Serialize entity embed settings to JSON string
Replace double quotes with single quotes inside entity-embed-settings
Add missing doc-block for rebuildEmbedForm
Use dependency injection for displayPluginManager
Use displayPluginManager function instead of class member
Revert "Replace double quotes with single quotes inside entity-embed-settings"

This reverts commit 9e08fbb139e9830099001ed4fbb2c7b9ed48c9df.
Use setAttributes for data attributes instead of setContextValue
Replace entity-embed-settings by data-entity-embed-settings
Replace entity-embed-settings by data-entity-embed-settings
Use AJAX to only replace the required part of the form
Add default value for data-entity-embed-display
Merge pull request #44 from cs-shadow/plugin-options

Add Display plugin options