[4.0] Remove remaining PSR-0 code in JLoader

[laoneo]

Pull Request for Issue #31159.

Summary of Changes

Removes the unused PSR-0 code in JLoader.

Testing Instructions

Open Joomla.

Actual result BEFORE applying this Pull Request

All works as expected.

Expected result AFTER applying this Pull Request

All works as expected.

Documentation Changes Required

Needs a note, that loadByPsr4 is deprecated.

[adj9]

I have tested this item ✅ successfully on 7ac17ea

Variation global conf: enable debug

Steps-

• Apply PR
• Log-out
• Login

I dont have error of use CMS.

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[jwaisner]

@laoneo looks like some errors from drone around the JS. Can you please correct?

/********/src/administrator/components/com_media/resources/scripts/app/Api.es6.js
1:1 error Parsing error: The keyword 'import' is reserved

[Fedik]

@jwaisner that JS errors not related to changes in current pull request

[infograf768]

restarted drone

[bonzani]

I have tested this item ✅ successfully on 7ac17ea

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/31188.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/31188.}

[infograf768]

Tks