Perform QA after session is finished

[atliSig]

The current QA process is "on-line":

1. A recording is captured
2. An asynchronous request is sent to the server
3. The server responds with a result

This makes the recording process sluggish. We should perform the QA in a batch as all the recordings are posted instead.

Thereafter, the results should be displayed in the session view and a clear notification about how many recordings were deemed "bad". An easy way for the user to delete these recordings should also be available so they appear again in the next session.