This implements a status effects receiver component (in a similar
fashion to the damage receiver component). The plan is to further extend
this component notably to handle graphical indication of status effects,
and a variety of other effects.
Currently implemented: ranged attacks can inflict status effects that
reduce HP over time.
This can be resisted by armour.
No units currently utilise this in-game but with proper graphics support
that could be changed.
Patch By: Mate-86
Reviewed By: wraitii
References #1912
Differential Revision: https://code.wildfiregames.com/D1252
This was SVN commit r22304.
