Created a new tab to show most used documents/applications, disabled by default.
Code looks good to me and I tested an earlier version of the patch and contributed the QQmlParserStatus hits. But sebas should chime in on the UI side. I alo didn't test this revision due to holiday/travel.
Not sure I'd rush it for 5.11. I'll probably have to tweak the formula coefficients for the score - how much deterioration over time it should have, ... (this is the main reason I'm making the graphs - to be able to easier debug the stats - having it in a user application is less important.