carbon-fields

• Removed Attachment field type, with backwards compatibility.
• The File and Image field types now save the attachment ID by default.
• Introduced File_Field::set_value_type() to easily change the saved value type.
• Added a Vagrantfile.
• Added some Field and Container tests.
• Renamed Date_Field::set_options() to Date_Field::set_datepicker_options().
• Introduced an abstract Predefined_Options_Field base for Select, Radio and Set field types.
• Added proxy Container, Field and Widget for shorter use statements.
• Introduced an abstract Scripts_Field base for Header Scripts and Footer Scripts field types.
• Introduced an abstract Meta_Datastore base for all meta datastore classes.
• Performed various other code fixes and improvements.

Initial version.