add log in plugin autoloader

[pifou25]

Description

add log in case of plugin error via the plugin autoloader, this is a great help for plugin developers :)

Suggested changelog entry

add log in case of plugin error via the plugin autoloader

Related issues/external references

Fixes #3017

Types of changes

• Bug fix (non-breaking change which fixes)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
  • This change is only breaking for integrators, not for external standards or end-users.
• Documentation improvement

PR checklist

• I have checked there is no other PR open for the same change.
• I have read the [La ligne directrice pour contribuer à ce projet / Contribution guidelines for this project).
• I grant the project the right to include and distribute the code under the GNU.
• I have added tests to cover my changes.
• I have verified that the code complies with the projects coding standards.
• [Required for new sniffs] I have added MD documentation for the sniff.

[Mips2648]

Why do you log exception in "core"? this is weird... who will ever thought about checking this log?

[pifou25]

Not sure where to put this log, and 'core' is the default for log path

core/core/class/log.class.php

Line 180 in 61c6ce2

public static function getPathToLog($_log = 'core') {

what else do you suggest ? 'plugin' could be better ?