Copied Main Menu to gameplay scene
Added Pause functionality (ESC key)
Save & Restore discovered zones
Applied vertical offset to asteroids (no more intersections!)
Nebula shader optimized to improve early exit
Nebula shader outputs light scattering to second render target
Modified depth of field shader to use nebula light scattering
Extracted all inspector code for database inspector into a single class per supported field type and wrote reflection code to invoke them automatically
Removed all Aetheria-specific code from database tools
Database View editor is now abstract and supports arbitrary grouping of entry types; specific users must implement their own database view
