Process bundled (zip) data upload

[EriktHove]

• [x] Create function to unpack zip file. Should iterate over folders recursively (process subfolders)
• [x] Parse csv files and import when valid
• [x] Extract meta data from video files and store videos

See Flowchart for design (for now not necessary) Update Flowchart

[RobvdDuim]

• Only for sensors that have metadata in .csv file
• User uploads .zip file
• For every file check if date is an actual date (if not throw exception)

[EriktHove]

Should be independent of folder structure

[EriktHove]

what seemed to work for the migration issues in the sensordata_sensordata database was deleting all the migration files (except the init file) in the sensordata app. (Watch the dependencies here)

Then I created a new migration file using 'python label_studio/manage.py makemigrations

That at first didnt work so I used the command python label_studio/manage.py migrate sensordata zero python label_studio/manage.py migrate

This did the trick