Issue #5543 (nation happiness from misc_mission)

[Namerutan]

• Should fix Issue #5543 (nation happiness from misc_mission, like in mansion map)

• Performance for missions is now composed of 4 factors, instead of just 2; added factors for MissionGoal and InfectedHumans (just basic implementation yet).

• Added 2 new fields to missionResults_t (float goalAccomplished, int infectedHumans), to prepare for new score calculations in future updates.

• Performance from killed aliens is now always zero or positive (small value), so the player will not get a negative score when completing missions different than simple xenocide; this was the main reason for the issue #5543, a negative value from not killed aliens a lot higher than the positive score from saved civilians.

• Moved all used constant values into the .h header file to gather all them, easing if they ever become scriptable.

Signed-off-by: Namerutan namerutan@hotmail.com

[DarkRainX]

Since geever is the campaign master I'll defer to him, he doesn't have a github account I think, so you might want to ping him on IRC