conqueror receives 50% of gold when conquering a human player (#3818)

## Description:

The motivation is to prevent snowballing players from also gaining too
much gold by conquering other players

- Adds `conquerGoldAmount` to `Config`/`DefaultConfig`: returns 100% of
captured gold for bots/nations, 50% for human players
- Updates `GameImpl.conquerPlayer` to use this amount for the
conqueror's gold gain (the conquered player still loses their full gold)

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

src/core/configuration/Config.ts

@@ -86,6 +86,7 @@ export interface Config {
   startManpower(playerInfo: PlayerInfo): number;
   troopIncreaseRate(player: Player | PlayerView): number;
   goldAdditionRate(player: Player | PlayerView): Gold;
+  conquerGoldAmount(captured: Player): Gold;
   attackTilesPerTick(
     attckTroops: number,
     attacker: Player,

src/core/configuration/DefaultConfig.ts

@@ -512,6 +512,17 @@ export class DefaultConfig implements Config {
     return base;
   }
 
+  public conquerGoldAmount(captured: Player): Gold {
+    if (
+      captured.type() === PlayerType.Bot ||
+      captured.type() === PlayerType.Nation
+    ) {
+      return captured.gold();
+    } else {
+      return captured.gold() / 2n;
+    }
+  }
+
   private startingGoldFor(playerInfo: PlayerInfo): Gold {
     const base = BigInt(this._gameConfig.startingGold ?? 0);
     const hc = this._gameConfig.hostCheats;

src/core/game/GameImpl.ts

@@ -1204,6 +1204,9 @@ export class GameImpl implements Game {
     const skipGoldTransfer =
       attacksSent === 0n && conquered.type() === PlayerType.Human;
     const gold = skipGoldTransfer ? 0n : conquered.gold();
+    const goldCaptured = skipGoldTransfer
+      ? 0n
+      : this._config.conquerGoldAmount(conquered);
 
     if (skipGoldTransfer) {
       this.displayMessage(
@@ -1222,22 +1225,22 @@ export class GameImpl implements Game {
         conqueror.id(),
         gold,
         {
-          gold: renderNumber(gold),
+          gold: renderNumber(goldCaptured),
           name: conquered.displayName(),
         },
       );
-      conqueror.addGold(gold);
+      conqueror.addGold(goldCaptured);
       conquered.removeGold(gold);
 
       // Record stats
-      this.stats().goldWar(conqueror, conquered, gold);
+      this.stats().goldWar(conqueror, conquered, goldCaptured);
     }
 
     this.addUpdate({
       type: GameUpdateType.ConquestEvent,
       conquerorId: conqueror.id(),
       conqueredId: conquered.id(),
-      gold,
+      gold: goldCaptured,
     });
   }
 }