Added GPL importer, new palette classes for clarification

Scripts/Import.gd

@@ -0,0 +1,53 @@
+extends Node
+
+# Declare member variables here. Examples:
+# var a = 2
+# var b = "text"
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	pass # Replace with function body.
+
+func import_gpl(path : String) -> Palette:
+	var result : Palette = null
+	var file = File.new()
+	if file.file_exists(path):
+		file.open(path, File.READ)
+		var text = file.get_as_text()
+		var lines = text.split('\n')
+		var line_number := 0
+		var comments := ""
+		for line in lines:
+			# Check if valid Gimp Palette Library file
+			if line_number == 0:
+				if line != "GIMP Palette":
+					break
+				else:
+					result = Palette.new()
+					var name_start = path.find_last('/') + 1
+					var name_end = path.find_last('.')
+					if name_end > name_start:
+						result.name = path.substr(name_start, name_end - name_start)
+				
+			# Comments
+			if line.begins_with('#'):
+				comments += line.trim_prefix('#') + '\n'
+				pass
+			elif line_number > 0 && line.length() >= 12:
+				var red : float = line.substr(0, 4).to_float() / 255.0
+				var green : float = line.substr(4, 4).to_float() / 255.0
+				var blue : float = line.substr(8, 4).to_float() / 255.0
+				var name : String = line.substr(12, line.length() - 12)
+				var color = Color(red, green, blue)
+				result.add_color(color, name)
+			line_number += 1
+			
+		if result:
+			result.comments = comments
+		file.close()
+	
+	return result
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+#func _process(delta):
+#	pass