Adds a `possible_scenario_types` list to Odyssey Scenarios containing
allowed canonicity types for a scenario.
`odyssey/proc/setup_scenario_variables()` now sets `scenario_type` by
picking from the `possible_scenario_types`.
By default or if the `possible_scenario_types` list is unset, a scenario
defaults to Non-Canon.
This allows a scenario to have both Canon and Non-Canon as an option.
Additionally, the Ruined Propellant Depot scenario has been given the
option of both Non-Canon and Canon to pick from.
Supercedes https://github.com/Aurorastation/Aurora.3/pull/20264.
3699c4f3e5