[5.2][Events] Class for MailBeforeRendering event

[Fedik]

Summary of Changes

Add an event class for forgoten event onMailBeforeRendering

Testing Instructions

In global configuration push "Send Test Mail" button.

Actual result BEFORE applying this Pull Request

Email sent without error

Expected result AFTER applying this Pull Request

Email sent without error

Link to documentations

Please select:

• Documentation link for docs.joomla.org:
• No documentation changes for docs.joomla.org needed
• Pull Request link for manual.joomla.org: TBD
• No documentation changes for manual.joomla.org needed

[crommie]

I have tested this item ✅ successfully on c1ca9b2

No errors, all seems to work.

But: I'm working on a PBF server website. I didn't receive the Test e-mail so I'm not sure it all still works (yes, I did change the global email address). Since I didn't receive it before as well as after I think it might have something to do with something server-related.

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[TLWebdesign]

I have tested this item ✅ successfully on c1ca9b2

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[richard67]

RTC

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[Hackwar]

Thanks for your contribution!