Fix ZenGetter and ZenSetter annotations

Before this commit, ZenGetter and ZenSetter in ZenExpansion could not
be defined. Since ZenExpansion requires static methods to work, but
the getters and setters will be invoked as virtual.

ZenScript/src/main/java/stanhebben/zenscript/type/expand/ZenExpandMember.java

@@ -77,12 +77,12 @@ public class ZenExpandMember {
 
 		@Override
 		public Expression eval(IEnvironmentGlobal environment) {
-			return new ExpressionCallVirtual(position, environment, getter, value.eval(environment));
+			return new ExpressionCallStatic(position, environment, getter, value.eval(environment));
 		}
 
 		@Override
 		public Expression assign(ZenPosition position, IEnvironmentGlobal environment, Expression other) {
-			return new ExpressionCallVirtual(position, environment, setter, value.eval(environment), other);
+			return new ExpressionCallStatic(position, environment, setter, value.eval(environment), other);
 		}
 
 		@Override