Removed most of ERRORS in inspection profile #172
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This is a first step towards PHP8 and ILIAS 8: We have to prepare the codebase of the plugin as far as possible under ILIAS 7, so that we can stay as close as possible to the version that we will publish for ILIAS 8 (see reason in PR #167).
I used the Inspection Profile for PHPStorm, which was also used in the PHP8 project in ILIAS, and was able to fix almost all ERRORS.
Since there are many changes in different places, testing them is certainly difficult.