Let RootPanels delete non immediately (keep default to immediate), mark default delete behaviour for WorldPanels to non-immediate.
This lets you use the pseudo class :outro for transitions when WorldPanels are deleted.
Allow Solid/Brush/Mesh entities to appear in Entity Tool and be spawnable using it (Hammer.EntityTool attrib)
ent_nav_blocker and func_nav_markup now appear in the entity tool for visibility
Entity tool buttons now use entity class description for tooltip if a tooltip was not provided