* Redid things with help from HadeanLake:
-"+[]% combat bonus in []" Unit Unique
-"+[]% combat bonus for units fighting in []" Nation Unique
-Both of these can check for terrain or Friendly Land or Foreign Land
-Function to add stacking modifiers
-Himeji Castle and Foreign Legion had uniques changed to fit this syntax
-Old way still works for now, but deprecated
* fixed comments about deprecation and the new syntax