Tax system

- New tax system
- Advisor window modeled after SC3k's
- Advisor start_dialogue() function is now connected to a SimEvent "advisor_message" signal
- Advisor windows are now autoloaded and no longer part of the core interface node
- Added 3D buildings from Micropolis repo

scripts/advisor_window.gd

@@ -0,0 +1,41 @@
+extends AcceptDialog
+
+export(String, FILE, "*.json") var dialogue_file
+# "character" would be "name" but it's already used by the base class
+export var character: String
+export var rank: String
+export(Texture) var avatar
+
+var dialogue_keys = []
+var dialogue_name = ""
+var dialogue_text = ""
+
+onready var avatar_texture = $Container/Advisor/Avatar
+onready var rank_label = $Container/Advisor/RankLbl
+onready var name_label = $Container/Advisor/NameLbl
+onready var description_label = $Container/DescriptionLbl
+
+func _start_dialogue(message):
+	_load_dialogue(dialogue_file)
+	_index_dialogue()
+	description_label.text = dialogue_keys[message].text
+	window_title = dialogue_keys[message].name
+	show()
+
+func _index_dialogue():
+	var dialogue = _load_dialogue(dialogue_file)
+	dialogue_keys.clear()
+	for key in dialogue:
+		dialogue_keys.append(dialogue[key])
+
+func _load_dialogue(file_path):
+	var file = File.new()
+	if file.file_exists(file_path):
+		file.open(file_path, file.READ)
+		var dialogue = parse_json(file.get_as_text())
+		return dialogue
+
+func _ready():
+	avatar_texture.texture = avatar
+	name_label.text = character
+	rank_label.text = rank