WIP: Update templates to use the new layout setting

[carolinan]

Update templates to use the new layout setting for container blocks:

"layout":{"type":"constrained"} : Inner blocks has wide and full width options
"layout":{"type":"default"}: inner blocks do not have wide and full width options
These replace "layout":{"inherit":true} and false

Please feel free to pick a template and add it to the same branch.

Closes #98

[bgardner]

@carolinan When this replacement occurs, do you notice that the previously existing class of is-global-padding disappears?

[bgardner]

On a theme of mine, I am replacing this:

<!-- wp:post-content {"layout":{"inherit":true}} /-->

With this:

<!-- wp:post-content {"layout":{"type":"constrained"}} /-->

The result is that the original markup of:

<div class="has-global-padding is-layout-constrained entry-content wp-block-post-content">

Becomes this:

<div class="is-layout-constrained entry-content wp-block-post-content">

[bgardner]

Created an issue in case this is a bug: WordPress/gutenberg#43673

[mikachan]

When this replacement occurs, do you notice that the previously existing class of is-global-padding disappears?

Yes, I can see the same happening on my local site: is-global-padding is removed.

[bgardner]

@mikachan Would you mind echoing this on the Gutenberg issue I created? I feel like this might be a significant bug and would love to see if we can get it fixed and into 14.0 release.

[mikachan]

I've pushed a few commits that I believe cover all the templates. I saw a few merge conflicts with trunk, but these should also be resolved.

I think this is ready for another review!

[carolinan]

These look correct to me.