Special variables for Edicts (Country and Empire):
# cost, base cost as in resource(s) and amount for activating the edict.

Special variables for Unity Ambitions where the cost is based on the next tradition unlock cost:
# unity_cost_mult, cost multiplier for a specific ambition ( 0.1 = 90% discount of the total unity cost etc).

Shared variables for both Edicts and Unity Ambitions:
# name, the name of the edict, also serves as localisation key.
# potential, country trigger to decide whether the edict should be shown.
# allow, country trigger to decide if whether this edict can be activated.
# effect, an effect that is executed when this trigger activates.
# prerequisites, tech requirements for this trigger.
# ai_will_do, determines AI scoring for edict
# modifier, a list of modifiers
# relay_network_modifier, a list of modifiers for the relay network
# length, number of days the trigger is active.