V3 Work

[dcarbone]

Goals:

• [x] Remove useless comments.
• [x] Remove FakeMap class.
• [x] Remove FakeSlice class.
• [x] Remove ScalarType interface.
• [ ] Use parameterized constructors for all models.
• [ ] Remove Transcoding type and usage.
• [ ] Remove Unmarshaller and Marshaller traits and flow.
• [ ] Localize entirety of json encoding / decoding to each individual model class.
• [x] Better support for dynamically declared fields.
• [ ] Enable all Time\Duration values to accept null|int|float|string|\DateInterval|Time\Duration for construction.
• [ ] Create enum types for enum values.