Better City-State Picker (UI)

Contents:
- A new mode has been added to the city-state picker that allows the number to be set for each city-state type.
- Alternatively, you can continue to use Classic mode and use the two new buttons to select the vanilla/mod city-state with one click.
- Does not affect saved games.
- Supports the new city-state type introduced by CIVITAS City States.
Supported Languages: 简体中文 繁體中文 English