Reset scale when restoring block state
Update references nested in other blocks
Merge pull request #397 from LLK/reset-block-scale

Reset scale when restoring block state
Merge pull request #398 from LLK/update-nested-references

Update references nested in other blocks
Merge tag 'v421'
Refactored single file loads to use a utility function.
This didn't need to be here
More work to allow the online version to override parts of the UI. Now all creations of MediaLibrary happen through Scratch.
Retaining the ID during the extension load process.