Andrew Nicols 171149b2a2 MDL-76727 core: Allow phpcs configuration to be overridden locally
This change reduces the priority of the shipped phpcs configuration to
allow for local overrides.

This is beneficial in several situations:
- when users wish to apply stricter or additional standards
- when the integration team wishes to trial new rules
2022-12-20 09:34:47 +08:00
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