Added EntityBrowserFormTrait (Activity Finder 4).

[duozersk]

Added EntityBrowserFormTrait class used in Activity Finder 4.

[gundevel]

Can one of the admins verify this patch? Use "o+k to test" or ''t+est this please" for manual build execution.

[ghost]

DeepCode's analysis on #9ce42b found:

• ⚠️ 1 warning 👇

Top issues

Description	Example fixes
MD5 hash (used in md5) is insecure. Consider changing it to a secure hashing algorithm (e.g. SHA256). Occurrences: EntityBrowserFormTrait.php:176	🔧 Example fixes

👉 View analysis in DeepCode’s Dashboard | Configure the bot

[podarok]

How urgent is this? @duozersk

[duozersk]

@podarok It is not urgent at all - I just needed a patch to reference for now. Will post here once it becomes more relevant.

[podarok]

Ok, great, thank you @duozersk

This is a backporting, code needed for external dependency @sarah-halby
It adds 0 functionality for Open Y - needed only in Activity Finder v4 as a dependency.

I'm fine with merging it even now because of 0 chance for any bugs or regressions. But technically this is a feature.
We can keep this PR up until needed for AFv4 without risk of code conflicts or code outdated.