Check win condition, end campaign and wipe save

[Wyqer]

Q	A
Bug fix?	no
New feature?	yes
Needs wipe?	no
Fixed issues	#393

Description:

Implementation of a check for the win condition X. (e.g. all capitals captured)
If the win condition returns true, display a debriefing screen, wipe the save and end the mission.

Content:

• Function to check if the win condition is met.
• Debriefing class and strings for mission end.
• Display debriefing and wipe save when win conditions met.

Tested on:

• Local MP Vanilla
• Local MP ACE
• Dedicated MP Vanilla
• Dedicated MP ACE