Extend looking for classes to Spring beans

Windup should scan the Spring configuration and detect java classes usage inside.

Currently, we don't cover Spring beans. There's /rules/javaee/xml-spring.windup.xml, but IIRC only things from rules-reviewed are taken into distribution...?
Even if it is, it deals with it using <xmlfile matches>
Which is insufficient - we need to make it work transparently, so that <javaclass references...> would catch that too.

For better imagination, an example:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
  <bean id="myKeyLocator" class="com.mformation.security.crypto.ClientSecretKeyLocator">
    <property name="keyFile">
      <value>C:/foo/qa1.key</value>
    </property>
  </bean> 
</beans>

This should be matched by

<javaclass references="com.mformation.security.crypto.ClientSecretKeyLocator">
     <location>CONSTRUCTOR_CALL</location>
     --- or ---
     <location>IMPORT</location>

Ideally, we should create a model of spring beans relations in the graph, which goes beyond the scope of this jira.