Remove more third party plugins from core build:

<!--<module>org.custommonkey.xmlunit</module>--><!-- use plugin from Orbit repository -->
<!--<module>org.slf4j</module>--><!-- Moved to third party repository -->
<!--<module>org.slf4j-log4j12</module>--><!-- Moved to third party repository -->
<!--<module>org.csstudio.platform.libs.epics</module>--><!-- Moved to third party repository  -->
<!--<module>org.csstudio.platform.libs.epics.linux</module>--><!-- Moved to third party repository  -->
<!--<module>org.csstudio.platform.libs.epics.macosx</module>--><!-- Moved to third party repository  -->
<!--<module>org.csstudio.platform.libs.epics.win32</module>--><!-- Moved to third party repository  -->
<!--<module>org.csstudio.platform.libs.hibernate</module>--><!-- Moved to third party repository  -->
<!--<module>org.csstudio.platform.libs.jdbc</module>--><!-- Moved to third party repository  -->
<!--<module>org.csstudio.platform.libs.jfreechart</module>--><!-- Moved to third party repository  -->
<!--<module>org.csstudio.platform.libs.jmock</module>--><!-- Moved to third party repository  -->
<!--<module>org.csstudio.platform.libs.jms</module>--><!-- Moved to third party repository  -->
<!--<module>org.csstudio.platform.libs.tine</module>--><!-- Moved to third party repository  -->