Jarcast's Ndongo-Matamba for VP 1.5

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Changelog:

• fixed audio bug.
• fixed UA applying also to City-States declaring war.
• added 10 turn timer (standard speed) between UA unit gift activation due to declarations of war .

Thanks to gwennog.

Thanks to Urzamax.

Thanks to gwennog for reporting.

Changelog:
Removed some yield gained on techs from Fort that makes the Kilombo too OP.