Improve resource management for coords, shapes and paints. - Make paint to use weak reference to release resource before collected. - Call Persistent<Object>::Dispose() before deleting the handle variable. Dispose() will real release Persistent handle. Handle variable is just a pointer to the handle.

<project>
	<scene src='list.mbsvg' />
	<source src='main.c'/>
	<source src='%n.c'/>
	<source src='%n.h'/>
	<source src='Makefile'/>
</project>