danielbachhuber 58ea8c82e4 REST API: Include block_version on Post content object.
The `block_version` denotes which version of Blocks the `post_content` contains. Introduces new `block_version()` function for versioning Blocks.

Props danielbachhuber, birgire.
Fixes #43887.

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git-svn-id: http://core.svn.wordpress.org/branches/5.0@43599 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-10-19 17:58:39 +00:00
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