Espionage Uniques, Buildings and Policy (#11401)

* Added OneTimeSpiesLevelUp, OneTimeGainSpy, SpyEffectiveness, EnemySpyEffectiveness and HiddenWithoutEspionage Uniques

* Spy effectiveness affects stealing tech and rigging elections

* Fixed HiddenWithoutEspionage

* Added Constabulary and Police Station

* Added cityFilter to SpyEffectiveness

* Added national Intelligence agency

* Added Great Firewall

* Fixed great firewall having a float value

* EspionageManager addSpy now returns Spy instead of name

* Added some simple espionage tests

* Fixed OneTimeSpiesLevelUp still wanting parameter

* Spy efficiency occurs after skill modifier

* Added another test

* Added Police State spy efficiency reduction unique

* Fixed "Hidden when espionage is disabled" wording

* Fixed "effectiveness" wording

* Changed "enemy spy effectiveness" unique to use negative matters

* Spy effectiveness only affect tech steal rate

* Changed "Gain an extra spy" and "Promotes all spies" uniques

* Removed Police State comment that is no longer accurate

* Changed spy effectiveness to be multiplicative

android/assets/jsons/Civ V - Gods & Kings/Policies.json

@@ -577,9 +577,9 @@
                 "name": "Police State",
                 "uniques": [
                     "[+3 Happiness] from every [Courthouse]",
-                    "[+100]% Production when constructing [Courthouse] buildings [in all cities]"
+                    "[+100]% Production when constructing [Courthouse] buildings [in all cities]",
+                    "[-25]% enemy spy effectiveness [in all cities]"
                 ],
-                // There are also some uniques regarding espoinage, which as of this writing is not yet implemented
                 "requires": ["Militarism"],
                 "row": 2,
                 "column": 4