Patterned territory (#786)

## Description:
This is meant to give players more customization options.
Permission handling hasn’t really been implemented yet.
## 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
- [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:

aotumuri

src/core/game/PlayerImpl.ts

@@ -81,7 +81,6 @@ export class PlayerImpl implements Player {
   public _units: Unit[] = [];
   public _tiles: Set<TileRef> = new Set();
 
-  private _flag: string | undefined;
   private _name: string;
   private _displayName: string;
 
@@ -109,7 +108,6 @@ export class PlayerImpl implements Player {
     startTroops: number,
     private readonly _team: Team | null,
   ) {
-    this._flag = playerInfo.flag;
     this._name = sanitizeUsername(playerInfo.name);
     this._targetTroopRatio = 95n;
     this._troops = toInt(startTroops);
@@ -130,6 +128,7 @@ export class PlayerImpl implements Player {
     return {
       type: GameUpdateType.Player,
       clientID: this.clientID(),
+      pattern: this.pattern(),
       flag: this.flag(),
       name: this.name(),
       displayName: this.displayName(),
@@ -178,8 +177,12 @@ export class PlayerImpl implements Player {
     return this._smallID;
   }
 
+  pattern(): string | undefined {
+    return this.playerInfo.pattern;
+  }
+
   flag(): string | undefined {
-    return this._flag;
+    return this.playerInfo.flag;
   }
 
   name(): string {