Allow up to seven teams for players (#445)

## Description:

- Allow up to seven teams for players, and one for bots.
- Add team count selection to the single player dialog.
- Select random number of teams in server rotation.

Fixes #456

## 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


![image](https://github.com/user-attachments/assets/cbc1ba82-9d06-4763-896c-abdce067a161)


![image](https://github.com/user-attachments/assets/9f82a0a5-c0bb-49b6-a714-2b13286a64ca)

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

fake.neo

---------

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

src/core/configuration/Config.ts

@@ -7,6 +7,7 @@ import {
   Gold,
   Player,
   PlayerInfo,
+  Team,
   TerraNullius,
   Tick,
   UnitInfo,
@@ -65,6 +66,7 @@ export interface Config {
   instantBuild(): boolean;
   numSpawnPhaseTurns(): number;
   userSettings(): UserSettings;
+  numPlayerTeams(): number;
 
   startManpower(playerInfo: PlayerInfo): number;
   populationIncreaseRate(player: Player | PlayerView): number;
@@ -122,6 +124,7 @@ export interface Config {
 }
 
 export interface Theme {
+  teamColor(team: Team): Colord;
   territoryColor(playerInfo: PlayerView): Colord;
   specialBuildingColor(playerInfo: PlayerView): Colord;
   borderColor(playerInfo: PlayerView): Colord;