* Add additional statistics characterics, improve rounding
* Improve name of age_usage_ratio
* Replace difference by three relevant distances
* Refactor attributes, remove stats, add metadata
* Fix binary sensor testcase
* Fix sensor defaults testcase
* Fix and enhance all testcases
* Remove age coverage from attr when not configured
* Refactor so only the relevant characteristic value is calculated
* Rename unclear characteristics, add timebound average
* Fix coverage warning
* Remove explicit functions dict
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