Rewrites region classes

[mxashlynn]

This update changes the API in far-reaching ways in order to separate design-time and play-time concerns in map-related types.

[0.4.0] - 2021-02-23

Pre-Alpha 3 API Revision

Adds

• Adds Status type as a base class for all mutable-at-play types, analogous to Models.
• Derives a Status-based partner class for most Model classes.
• Adds Pack container type as base for ParquetModelPack and ParquetStatusPack.
• Adds LibraryState static class to track build and run characteristics, particularly Debug-vs-Release and Play-vs-Edit.

  Removes

• MapModel abstract class, as there is only one map-related Model in the new hierarchy.

  Changes

• Merges the definitional elements (procedural generation instructions and metadata) of MapRegion and MapSketch into single RegionModel.
• Merges the mutable elements (parquets and their statuses) of MapRegion and MapSketch into a single RegionStatus class.
• Changes MapChunk to a stand-alone class rather than a Model subtype.
• Renames namespace from Map to Region.
• Alters the BeingModel class family to better interoperate with the new RegionModel class family.
• Changes the name of Inventory class to InventoryCollection to avoid confusion in the BeingStatus classes.
• Updates the serialized example data for RegionModel and BeingModel class families.
• Reimplements cloning to enforce deep copying.
• Many minor fixes and corrections along the way.