Generate CS classes from the loaded data model

[unforbidable]

A small host of C# types will be generated based on the loaded data model:

• A record class for every record to maintain record data.
• A sub-record class for every structure and field group to maintain sub-record data, used by record classes.
• A class for every target (as) structure, such as Color.
• Two interfaces IForm for FormReference and IFormCollection for FormReference[].
• A single static class with extension methods for casting references from any form type to a specific form type, and for filtering a list of references from any form to a specific form type, a set of two for every form type.
• A class derived from the Variable class for each struct union.
• An enum for every enumeration type.
• A proxy class for every record and sub-class, for access control.
• An interface for every record and sub-record class, for isolation of implementation.
• An interface for every adapter to handle conversion between fields and properties. This includes so called default adapters that sort of make sense, although they are not currently used just yet.
• A single interface to serve as provider of adapter implementations. (The patcher implements this interface to provide adapter implementations for the data model.)
• A single class to serve as the function index and provider.
• An enum with containing all functions.
• A single static class that will store various information, such as the patcher version.
• A set of classes Variable for variable types (strongly typed unions), supporting 2 through 10 types.
• Additionally the serialized data model will be embedded as a binary resource.

[unforbidable]

Completion depends on #52