Add back ability to resize and drag Events in ResourceView

For whatever reason, ResourceView lacks the ability to resize and drag events. The code still has the structure necessary to do so (similar to AgendaView), but some key variables were not being defined and used. I've added these back to the source to allow for resizing with the handle and dragging up or down in the time slots.

Was there a specific reason that this functionality should have been removed or was it simply an oversight?