LDEV-5259 Use MVC initialisation via annotationManually triggering controller scanning by adding an annotation handlerbean does not register all useful support beans. If<mvc:annotation-driven> is used in spring-servlet.xml, all support beansare registered via WebMvcConfigurer.<mvc:path-matching suffix-pattern="true" /> need to be added because weuse .do suffix for Spring actions and suffix was turned off for Spring5.3https://github.com/spring-projects/spring-framework/issues/24179
LDEV-5204 Copy and refactor doKu code for Whiteboard usedoKu is a similar tool which hold various useful elements, like workingwith an external Node server, Gallery Walk etc. Its code has been takenand reused as a base for Whiteboard.