Rework recording

[Hpn4]

A lot of subsribers has been deleted allowing the notifier system to only be a GUI parts. So i have moved it to the includes/gui/notifier directory.

This PR is mainly to delete subsribers and a feature Michael ask to have: when all the frame are acquired, the UI show a progress bar for the saving.

I also fixed a couple of bugs:

• when recording in unlimited number of frames and then clicking stop. It's not the acquisition that was stop but the saving so if we record for like 2s and then stop, on reality the file will only have 1.8s for example.
• the record queue was not reset before recording. So when recording a second time, the record queue still has some frames of the previous record (frames acquired during one cycle of the pipe to be precise)
• when recording, if the record queue or the input queue was overwritten, the next record will stop instantaneously with the same error while it's not true.

[alexispinson]

Seems quite good for me