Civilian Deaths should affect X-COM mission rating

[FilmBoy84]

Currently, along with issue #305 making ALL civilians become X-COM targets civilian deaths do not affect X-COM score in all instances - AND THEY SHOULD NOT ALWAYS AFFECT SCORE (See https://www.ufopaedia.org/index.php/Population_(Apocalypse)#Civilian )

To fix this, firstly there needs to be a mechanism to make civilians hostile / neutral / friendly according to building owner relations as per issue #305

Once it is established if X-COM will target civilians in a building then a system for scoring their deaths needs to be implemented into the mission accounting that regular civilians do not normally affect score.

NOTE: "Civilian" is a separate organisation to the building organisation in vanilla apoc; this is important as relations with this "invisible" organisation affects X-COM recruitment. So the issue with scoring is two fold. ALL civilian deaths need to affect the "civilian" organisation NEGATIVELY, but the hostility of civilians in a building should be dictated by the building owner.

Ideally, we want X-COM to NOT target civilians, even if hostile, by default (as it is in vanilla game); but how their deaths affect the building owners organisation and hidden civilian organisation relations needs to be sorted nonetheless.

[FilmBoy84]

Jarskih fixed the X-COM targetting civilians in #816

However, killing civilians by accident or in a crossfire still does not appear to negatively affect recruitment via altering X-COM's relationship with the hidden "Civilian" organisation

It still needs to affect combat/mission rating also

For that reason, leaving open

[FilmBoy84]

An additional point for the UnitAI / Pathfinding projects

If the Standard or Evasive stance is set for a unit, they should attempt to move to or strafe to a position that would allow them to open fire with minimal risk to civilian lives if they are present in the area or blocking LoS/LoF

X-COM should only open fire if a civilian is blocking LoS/LoF if the stance is set to aggressive and even then, looking at OG/Beta2 behaviour, should raise/lower their weapon for a time to see if the the civilian will pass before firing