JBIDE-11065: Use only mojo

* added p2StatsUrl
* remove uncategorized
* added READMEs to output repository

* fetch-zips-for-aggregate goal on site and soa-site

* Output copied into a site_assembly.zip for publish
JBIDE-11065: Use gstring-maven-plugin to generate result page
add source features to Developer Resources category (JBIDE-13926)
JBIDE-13926, JBIDE-13928 Do not include source feature for org.jboss.tools.maven.apt.feature
remove 0.16.0-SNAPSHOT as version of org.jboss.tools.tycho-plugins:repository-utils
JBIDE-11065: Use only mojo

* added p2StatsUrl
* remove uncategorized
* added READMEs to output repository

* fetch-zips-for-aggregate goal on site and soa-site

* Output copied into a site_assembly.zip for publish
remove obsolete aggregate/pom-all.xml file; fix comments in aggregate/pom.xml; bump parent to Beta1 (from Alpha2)
Merge branch 'JBIDE-11065_3' of github.com:nickboldt/jbosstools-build-sites into JBIDE-11065_3

Conflicts:
	aggregate/coretests-site/pom.xml
	aggregate/site/pom.xml
	aggregate/webtools-site/pom.xml