Import aliases for Custom Classes

Import aliases support for Custom Classes. This allows you to import classes and other custom classes with an alias inside of a Custom Class.

This includes some improvements on "parseModuleDecl()"

hscript/customclass/CustomClassDecl.hx

@@ -157,4 +157,5 @@ typedef CustomClassImport = {
 	var ?name:String;
 	var ?pkg:Array<String>;
 	var ?fullPath:String; // pkg.pkg.pkg.name
+	var ?as:Null<String>; // import pkg.Name as OtherName
 }