changed UniversalId::Type_Scene from index to string ID argument (argument is the worldspace)
added hint parameter for UniversalId viewing requests
changed edit requests from row index format to UniversalId/hint format
changed name of default worldspace (should reduce chance of a name conflict)
replaced global world->scene menu item with individual view context menu items in cell and reference tables
subclasses scene widget for worldspace scenes
moved navigation into the WorldspaceWidget
specialising WorldspaceWdiget into paged and unpaged subclasses
fixed SceneWidget destructor
ambient lighting in interior cells
do not offer view action for cells flagged as deleted
some general cleanup
close interior cell view when cell is deleted
Merge branch 'scene'