paragraphs_gridstack 1.0.0-alpha2

The second alpha release of the module, includes major and minor bug fixes, improvements, and new features.

1. #3337184: Deprecated: Using ${var} in strings is deprecated, use {$var} instead
2. #3337212: Remove 'allow_rounded_class' from the optionset config entity
3. #3335173: Method GridstackContainer::view() can't attach external libraries
4. #3337102: Configurations off-canvas: route and form
5. #3337099: Need to implement storage for the styles
6. #3337213: Paragraphs Gridstack Demo uninstalls incorrectly
7. #3339642: Configurations off-canvas: styles list validation
8. #3338958: Configurations off-canvas: add ParagraphsGridstackStyleManager service
9. #3346353: Replace node word with optionset in GridstackStylesManager
10. #3298432: Create a Demo module
11. #3321469: Render gridstack state inside data attribute
12. #3322699: SettingsSummary for the GridstackConrainer Behaviour plugin
13. #3324317: Gridstack Libraries metadata
14. #3337168: Remove outdated method prepareContent() method
15. #3337169: Remove useless variables in buildBehaviorForm()
16. #3319561: Gristack management buttons should be moved to backend
17. #3337190: Coding standards in Paragraphs Gridstack Demo module
18. #3335173: Method GridstackContainer::view() can't attach external libraries

The #3336755: Unable to install library via composer is not solved, but hotfix released.