Improve random spawn (#2465)

## Description:

After the v27 playtest, some players experienced instant death on spawn.
The issue was that the human random spawn occasionally coincided with a
bot’s spawn. Previously, bot spawns didn’t account for human spawn
locations and could appear on the same tile, now they don’t.

## Please complete the following:

- [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:

nikolaj_mykola

---------

Co-authored-by: Evan <evanpelle@gmail.com>

src/core/game/Game.ts

@@ -547,6 +547,8 @@ export interface Player {
 
   hasSpawned(): boolean;
   setHasSpawned(hasSpawned: boolean): void;
+  setSpawnTile(spawnTile: TileRef): void;
+  spawnTile(): TileRef | undefined;
 
   // Territory
   tiles(): ReadonlySet<TileRef>;

src/core/game/PlayerImpl.ts

@@ -102,6 +102,7 @@ export class PlayerImpl implements Player {
   public _outgoingLandAttacks: Attack[] = [];
 
   private _hasSpawned = false;
+  private _spawnTile: TileRef | undefined;
   private _isDisconnected = false;
 
   constructor(
@@ -347,6 +348,14 @@ export class PlayerImpl implements Player {
     this._hasSpawned = hasSpawned;
   }
 
+  setSpawnTile(spawnTile: TileRef): void {
+    this._spawnTile = spawnTile;
+  }
+
+  spawnTile(): TileRef | undefined {
+    return this._spawnTile;
+  }
+
   incomingAllianceRequests(): AllianceRequest[] {
     return this.mg.allianceRequests.filter((ar) => ar.recipient() === this);
   }