-ability to set default textures in shader (needed for visual shader editing)

-work in progress new graph system (will replace current one)
-crash fix in s3m loader (out of bounds acess)
-fixed vbox overriding of separation (fixes empty line between section tabs)

servers/visual/rasterizer_dummy.cpp

@@ -221,6 +221,16 @@ void RasterizerDummy::shader_get_param_list(RID p_shader, List<PropertyInfo> *p_
 
 }
 
+
+void RasterizerDummy::shader_set_default_texture_param(RID p_shader, const StringName& p_name, RID p_texture) {
+
+}
+
+RID RasterizerDummy::shader_get_default_texture_param(RID p_shader, const StringName& p_name) const {
+
+	return RID();
+}
+
 /* COMMON MATERIAL API */