Contract Editor: add more fields

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• [ ] Add more fields to the contract editor
• [ ] store the fields in the contracts_data dictionary
• [ ] Hide fields based on contract type
• [ ] move the code out of the apps.py into a separate script

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Call/Put: use a https://dash.plotly.com/dash-core-components/radioitems Strike: use knob Cap/Floor: use https://dash.plotly.com/dash-core-components/rangeslider

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Task 1

• add the Call/Put Radio Button
• update the contracts data in the callback to add this new field.
• in timetables.py whichever contract has a field like is_call, use it. otherwise ignore it.