Settings GUI, Automatic schematic boundary calculation, other bug fixes
Added settings GUI available via /rsw or /rsw settings
Added automatic schematic boundary calculation for schematics.
Fix for
- Cannot invoke "joserodpt.realskywars.api-game-modes.RSWGame$Mode-name ()" because "this.mode" is null
- Cannot invoke "joserodpt.realskywars.api.game.modes.RSWGame.reset()" because the return value of "joserodpt.realskywars.api.managers.MapManagerAPI.getMap(String)" is null
Other code optimization fixes