XCOMMONS-620: Move WikiStream generic part to commons filter

xwiki-platform-core/pom.xml

...ion-handlers/xwiki-platform-extension-handler-xar/pom.xml

...wiki/extension/xar/internal/handler/XarExtensionPlan.java

...iki/extension/xar/internal/handler/packager/Packager.java

xwiki-platform-core/xwiki-platform-filter/pom.xml

...wiki-platform-filter/xwiki-platform-filter-events/pom.xml

...m-filter-events/xwiki-platform-filter-event-model/pom.xml

...rc/main/java/org/xwiki/filter/event/model/FarmFilter.java

...va/org/xwiki/filter/event/model/WikiAttachmentFilter.java

...in/java/org/xwiki/filter/event/model/WikiClassFilter.java

...org/xwiki/filter/event/model/WikiClassPropertyFilter.java

...java/org/xwiki/filter/event/model/WikiDocumentFilter.java

...rc/main/java/org/xwiki/filter/event/model/WikiFilter.java

...n/java/org/xwiki/filter/event/model/WikiObjectFilter.java

...rg/xwiki/filter/event/model/WikiObjectPropertyFilter.java

...in/java/org/xwiki/filter/event/model/WikiSpaceFilter.java

...rm-filter-events/xwiki-platform-filter-event-user/pom.xml

...rc/main/java/org/xwiki/filter/event/user/GroupFilter.java

...src/main/java/org/xwiki/filter/event/user/UserFilter.java

...m-filter-events/xwiki-platform-filter-event-xwiki/pom.xml