Fixed typos in comments.
Added alias methods with easier names for the users.
Added some instruction comments.
Made it possible for field type definition class to pass source urls of styles and scripts with some additional options.
Renamed some methods used in the field type definition classes.
Reconstructed the geometry custom field type.
Removed a redundant line.
Fixed a type in a method name.
Reconstructed the date custom field type with repeatable field support.
Reconstructed the date custom field type with repeatable field support.
Reconstructed the date_time field type with repeatable field support.
Removed unnecessary comments.
Corrected a comment.
Reconstructed the time field type with repeatable field support.
Removed a redundant line.
Updated a comment.
Added examples of repeatable fields for date, date_time, and time custom field types.