* Convert Config to a singleton
Continuation of #14364 by @Jellyfrog
This time, make the old class a shim for the facade. Will update references in a separate PR.
* Remove logging config call
* Apply fixes from StyleCI
* Fix bad Git constructor call
* Fail on config table does not exist instead of throw exception
* Inline LibrenmsConfig::isRegistered()
* Debug call in case there are more issues,
remove before merge.
* Fix up config tests
* Allow config cache controlled by CONFIG_CACHE_TTL (disabled by default for now)
* Enable config cache for tests
* Remove debug statement and deprecation phpdoc
* Apply fixes from StyleCI
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Co-authored-by: Tony Murray <murrant@users.noreply.github.com>
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