Add gold for encircling someone + display message (#369)

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [X] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

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

src/core/execution/PlayerExecution.ts

@@ -2,6 +2,7 @@ import { Config } from "../configuration/Config";
 import {
   Execution,
   Game,
+  MessageType,
   Player,
   PlayerID,
   TerraNullius,
@@ -11,6 +12,7 @@ import { calculateBoundingBox, getMode, inscribed, simpleHash } from "../Util";
 import { GameImpl } from "../game/GameImpl";
 import { consolex } from "../Consolex";
 import { GameMap, TileRef } from "../game/GameMap";
+import { renderNumber } from "../../client/Utils";
 
 export class PlayerExecution implements Execution {
   private readonly ticksPerClusterCalc = 20;
@@ -201,6 +203,19 @@ export class PlayerExecution implements Execution {
       this.mg.ownerID(t) == this.player.smallID();
     const tiles = this.mg.bfs(firstTile, filter);
 
+    if (this.player.numTilesOwned() == tiles.size) {
+      const gold = this.player.gold();
+      this.mg.displayMessage(
+        `Conquered ${this.player.displayName()} received ${renderNumber(
+          gold,
+        )} gold`,
+        MessageType.SUCCESS,
+        capturing.id(),
+      );
+      capturing.addGold(gold);
+      this.player.removeGold(gold);
+    }
+
     for (const tile of tiles) {
       capturing.conquer(tile);
     }