Support for nested forms entry meta

[doekenorg]

This PR addresses #1892.

Basically everything asked for in that issue is solved. But to reference the parent in the merge tags you need to use: {Parent:<field>} So {Parent:1.2} or {Parent:entry_id} or {Parent:form_id}.

And to be able to connect in the view search field you need to search for the key gpnf_entry_parent or gpnf_entry_parent_form.

💾 Build file (7f95583).

[rafaehlers]

@doekenorg this merge tag isn't working:

To be honest, I couldn't find that Merge Tag in Gravity Wiz docs: https://gravitywiz.com/documentation/gravity-forms-nested-forms/

Everything else works fine!

[doekenorg]

@rafaehlers yeah that is not a valid merge tag. It doesn't exist. I did not invent these; these are from GravityWiz themselves. I only activated it for views :-D

[rafaehlers]

David from Gravity Wiz confirmed that Merge Tag doesn't work, so we're good to go! ✅