LMS-445 introducing IPageController and usage

openbis/source/java/ch/systemsx/cisd/openbis/OpenBIS.gwt.xml

...nbis/generic/client/web/client/IGenericClientService.java

...generic/client/web/client/IGenericClientServiceAsync.java

.../client/web/client/application/AbstractAsyncCallback.java

...openbis/generic/client/web/client/application/Client.java

...ric/client/web/client/application/GenericViewContext.java

...eneric/client/web/client/application/IPageController.java

...generic/client/web/client/application/ui/LoginWidget.java

.../web/client/application/util/InvalidSessionException.java

...neric/client/web/client/application/util/StringUtils.java

...ent/web/client/application/util/UserFailureException.java

...d/openbis/generic/client/web/public/generic-dictionary.js

...enbis/generic/client/web/server/GenericClientService.java

...eneric/client/web/server/GenericClientServiceServlet.java

...urce/java/ch/systemsx/cisd/openbis/public/css/openbis.css