– propertyListValueFormat:
color
blur
offsetX
offsetY
The blur.
@property (nonatomic, strong) NSString *blur
The color.
@property (nonatomic, strong) NSColor *color
The offsetX.
@property (nonatomic, strong) NSString *offsetX
The offsetY.
@property (nonatomic, strong) NSString *offsetY
Returns the content of the object to store it in pList.
- (id)propertyListValueFormat:(GSFormatVersion)formatVersion
the version of the dict
This is used to store the data in the .glyphs file.