Don't recompute auras of each and every entity globally upon playerdefeat, but only all player auras (for simplicity, and the affected units, structures upon OwnershipChange), refs rP19093 / D12.
The next diff changes this to a global message subscription, so that it is easier to recognize.

Fixes #5099.
From Differential_Revision: https://code.wildfiregames.com/D1426
Pointed out by: fatherbushido
Reviewed By: temple