Deliver workarounds to Gutenberg issues as PRs and tidy Fizzie when implemented

[bobbingwide]

To date I've developed local workarounds for a number of issues found in Gutenberg's experimental Full Site Editing solutions.
I summarised the local improvements that I've made so far in #18.

Requirements

In the long term I'd want to see these problems addressed in Gutenberg / WordPress core.
When this has been done, there should be no need for the local workaround.
This issue is to track issues and PRs as they progress through Gutenberg
then to remove the local workaround when it's no longer necessary.

Proposed solution

• Raise a Gutenberg issue for each problem
• Implement a PR to fix the issue.
• Remove the local change when the PR's been merged, or otherwise fixed.

THIS TABLE IS WELL OUT OF DATE - 2022/01/12

Area	Fizzie issue	Gutenberg issue	Gutenberg PR(s)	Merged?	Removed from Fizzie
core/template-part	#1	WordPress/gutenberg#26010	WordPress/gutenberg#26772
core/post-excerpt	mentioned in #18	WordPress/gutenberg#26581	WordPress/gutenberg#26806 ( replaces 26785 )	9.4
core/query-pagination	#18	WordPress/gutenberg#26557 ( pre-existing )	WordPress/gutenberg#26831
core/query-loop	#11	WordPress/gutenberg#25377 (pre-existing)	WordPress/gutenberg#26825
core/template-part postId	#1 (comment)	WordPress/gutenberg#26734	WordPress/gutenberg#26812
core/template-part wpautop()	#20	WordPress/gutenberg#26731	WordPress/gutenberg#26809
core/post-content	#7	WordPress/gutenberg#26593	WordPress/gutenberg#26807
core/post-hierarchical-terms	#29	WordPress/gutenberg#26851	WordPress/gutenberg#26854	9.4
core/post-content	#27	WordPress/gutenberg#26923	WordPress/gutenberg#27012
core/navigation-link	#22 site_url part
core/navigation	#22 current-menu-item part

[bobbingwide]

For Fizzie v1.0.0 I've commented out the logic that's no longer needed, but not yet removed it.
I've also updated the logic so that the remaining overrides are applied when Gutenberg is not activated.
This caters for sites which have WordPress 5.9; the first version where Gutenberg is not required for an FSE theme.

[bobbingwide]

Closing this issue. I no longer intend raising PRs against Gutenberg. But look forward to when I no longer feel the need to override block rendering.