- Reads from defined constants on plugin bootstrap.
- Disabled plugin settings fields when defined constants are used.
_ Prevents savings plugin settings that are using defined constants.
* Fixes missing i18n translation in main plugin file.
* Adds update POT file.
* Enforces i18n checks on commit with GrumPHP.
* Adds i18n check step to Travis CI builds.
* Ensures PHP Code Sniffs continue to pass.
* Fixes all code base issues to pass a level 5 PHP static analysis.
* Updates PHPStan configurations to use a level 5 baseline.