Blueprint Builder: Fix stuck loader bar #1284
Merged
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Fixes the stuck Playground loading process on
https://playground.wordpress.net/builder/builder.html
Technically, we trash the existing iframe and start a new one instead of trying to bind multiple Playground clients to the same one. They very likely competed for events and missing even a single one meant not finishing the Playground loading sequence.
This also fixes the following issues with the builder:
Furthermore, it adds an "Edit the Blueprint" link to the hamburger menu.
Closes #863
Follow-up work
Scrap the entire Builder codebase and rebuild it with CodeMirror and generic autocompletion (Ace doesn't work well for mobile, and the current autocompletion is bound to an exact JSON schema shape).
Testing plan