Fix the issue for name confliction between two used traits. - When a class use two or more traits, and the name of a method from one trait conflicts with an attribute from another one, composite will be fault for setting method proxys. - Solution is to skip attributes that is not callable when setting proxys.

<project>
	<scene src="/tmp/scene.mbsvg"/>
	<scene src="/tmp/second.mbsvg"/>
	<source src="/tmp/main.c"/>
	<source src="/tmp/second.c"/>
</project>