Mass change to streamline the metadata JSON. For boolean fields which are rarely true (e.g. permanent, weakness) the fields are removed and assumed to be false if absenst.
It also removes the traits field if it was empty, which would apply to non-card cards like Minicards and Upgrade Sheets.
- Split upgrade sheets to follow the slots/data pattern
- Factor out methods to set selections on upgrade sheets
- Factor out method to add Summoned Servitor minicard
- Add type 'UpgradeSheet' to appropriate cards
- Remove handleStartsInPlay() method and detect it as a default zone
