白板样式配置项

@property (assign, nonatomic) ARBoardTextStyle textStyle;

@property (assign, nonatomic) int textSize;

@property (strong, nonatomic) UIColor *textColor;

@property (strong, nonatomic) UIColor *brushColor;

@property (strong, nonatomic) UIColor *brushColor;

@property (assign, nonatomic) int brushThin;

@property (strong, nonatomic) UIColor *selectBoxColor;

@property (strong, nonatomic) UIColor *globalBackgroundColor;