QC changes and SessionLoader
- Adding brainbox.io.one.SessionLoader for standardized loading of session data
- Changes to TaskQC, VideoQC and DLCQC thresholds and aggregation
- Unfreezing numpy version
- Adding probabilistic brain regions lookup in ibllib.atlas.atlas.BrainAtlas.get_labels
- Removing two voxelless areas from beryl atlas
- Minor updates to audio events detection and audio welchogram