Analyse files of a new sub-folder under a root (already) mapped in library

[vespadj]

Feature Description

When we add a new sub-folder under a root already mapped in library, it should be nice and quick to launch Analyse from here.

Aspected:

1. go to folder, select all files, right-click, Analyse BPM.
   Or
2. Right-click on folder (on left side), Analyse BPM.

Some consideration.
Other software support many kind of analysis: complete, only BPM, BPM+key.
A new user, first of all, try to scan BPM or import BPM + cues to test the app.