RestAPI v3: revised ReactionResource
Fixed Core-392: Make Statement check fail if trigger filters a property not present in event
Fixed Core-476: Plugin start should execute onStart() user code after framework operations
Fixed Core-477: Fix BehaviorManager and add filterByZone feature
Core-404: plugin uninstaller
 - extended and rearranged client API
 - added Uninstall button in frontend-java PLuginConfigure class
 - added uninstall support as DELETE method in RestApi v3
 - added two translation strings
Partial fix to Core-404 and Core-478. Uninstall regresssion in restapi, not working anymore. Removed the number of plugins in a category in 'Install from marketplace' form
RestApiv3: Make API fully CORS compliant (fixed OPTION method params)