Jarcast's Zimbabwe for VP 2.0

Changelog:
- Nerfed UA: removed +1 Food from Mines, Pastures.
- Nerfed UB1: +1 Science for every 5 Defense in City (was 3).

Now Wildlife resource avoids forests/jungles tiles where a worker is building an improvement.
Fixed typo that did not allow to create a forest/jungle to place Wildlife if there are no eligible plot beforehand.

Not-yet-revealed resources under Cities' plot do not count anymore toward the UA production bonus if the player have not yet researched the corresponding reveal tech.

Title.

Apologizing quack :V

Misstyping removal.