Move format metrics logic from processor to Metrics\Formatter and fix Overlay UI tests by formatting manually w/ an Html Formatter.

Add unit tests for new Metrics Formatter classes and remove existing ones. Small change to Overlay included and bug fixes to metrics formatting code included.

Refresh the Cache in tests so that custom variable max slot\ is properly initialised, and all segments are found

Only use '-' as formatted average page generation time if formatting for HTML (for backwards compatibility).

CliMulti: If process or output size is unexpected large, declare it as finished

Handle evolution metrics & goal metrics in Inconsistencies::getPercentMetrics, use correct time formatting in two other places, and fix ImportLogsTest.

Make sure manual calls to MetricsFormatter::getPrettyTimeAsSeconds will use sentence if sentence was used before.