MUMMNG-2046 : Split into multimodule project so we can overwrite the inherited 404 and 500 page

myuw-root-jar is a module that will generate a jar that has a single class for tomcat. This class just redirects 404's to `/404.html` and 500 and above to `500.html`. This will be placed in tomcat's classpath.

myuw-root-war is the ROOT.war file that has those html files.

See merge request !2