Add apply, remove and set_ability functions to Seals

[bepisfever]

Seals now have:
apply(self, card): Runs when the Seal is applied on an obtained card, or when the card with the Seal is obtained.
remove(self, card): Runs when the card with the seal is removed, or when the seal is removed.
set_ability(self, card): Runs when the Seal is applied on a card.

I also added a hook that adds added_to_deck to all playing cards at the start of run.

Wiki PR update: Steamodded/Wiki#53

Additional Info:

• I didn't modify api's or I've made a PR to the wiki repo.
• I didn't modify api's or I've updated lsp definitions.
• I didn't make new lovely files or all new lovely files have appropriate priority.

[DigitalDetective47]

It would be nice to be able to distinguish between calling cases. For example with removed: being able to differentiate the seal being replaced from the card with the seal being destroyed.

[english5040]

as always, naming concerns: apply/remove/set_ability don't really match with what they actually do. I propose add_to_deck/remove_from_deck (like Jokers), set_seal