Support for square bracket parameters in scripted_effects and scripted_triggers #57

#Province effect
upgrade_building = {
	[[trade]
		if = {
			limit = { has_building = trade_depot }
			add_building = stock_exchange
		}
		else_if = {
			limit = { has_building = marketplace }
			add_building = trade_depot
		}
	]
	[[government]
		if = {
			limit = { has_building = courthouse }
			add_building = town_hall
		}
	]
}

upgrade_building = { trade = yes }

define_advisor_of_random_type = {
  define_advisor = {
	  [[name] name = $name$ ]
	  type = treasurer
	  skill = $skill$
	  [[culture] culture = $culture$ ]
	  [[religion] religion = $religion$ ]
	  [[discount] discount = $discount$ ]
	  [[cost_multiplier] cost_multiplier = $cost_multiplier$ ]
  }
}

define_advisor_of_random_type = { skill = 1 culture = some_culture }