Merge pull request #6 from ls612/Ea

Changes to LuaCanAcquirePlot (still not enabled)
Enabled CityCanAcquirePlot with fix
Merge pull request #7 from ls612/Ea

Added City and Player Yield percentage modifiers
Yield fixes
More plot effect support
Unit capture GameEvents
Animals Civ ID fix
Modded CanSaveUnit to pass bDelay
Manual conflict merge

Trying to do command line conflict merge; not sure what I'm doing...
Minor tidy up

Caught missing #ifdef from looking at diff files to base dll
Prep for merge

Undo some of last commit for automerge
Merge pull request #9 from ls612/Ea

Fixes for yesterday's pull
Fixed CvUnit::canBuildRoute logic

I think... (still need to test)
First fix for removal Builds AI
Allow a specific negative yield
Fix Merge Conflict