Statistics View - Annotations

[lars-reimann]

Is your feature request related to a problem? Please describe

Currently, it's not possible to see statistics about the API and it's usages in the editor.

Desired solution

Create a new view that visualizes statistics about the API, it's usages, and the annotations.

Data about annotations

Show how often individual annotations are used. For example:

* @Unused: 23
* @Rename: 45
...

Clicking on the annotation in question should populate the filter box appropriately. For example, clicking on the @Unused text should then update the filter to only show API elements that are annotated with the @Unused annotation.