Add an OpaqueTypePrefix string to the model configuration with
default `opaque_type_`. This is used to build the C name of the
artificial structs that wrap model array types and keeps the prefix
configurable alongside the other artificial-name prefixes.
After this commit, every non-key field is treated as if it was optional
while every key field (plus every auto-generated `Kind` field) - as if
it was required.
This allows to avoid having to specify the `rootType` (stable within
the entire tree) manually each time a reference is introduced.
Thanks to that, a much nicer syntax of:
```yaml
- name: MyTypeField
reference-to: TypeDefinition
```
can replace the current one:
```yaml
- name: MyTypeField
reference:
pointeeType: TypeDefinition
rootType: Binary
```
This commit bans from the model array types in as argument or return
types in CABIFunctionDefinition.
CABIFunctionDefinition implies we're decompiling towards C, and C does
not support array arguments (passed by copy) nor array return types.
Banning these from the model reduces the number of situations where we
have to emit artificial array wrappers (not present in the model) around
types when printing C code, simplifying the handling of such situations
when translating to clift and in general in the decompilation pipeline.
Here we start restructuring the the schemas YAML such that it
contains a top-level `version` field. In this commit we only modify
the YAML, the build system changes will come later, to avoid
enormous commits.
These schema files are currently generated at build time by
collecting various TUPLE-TREE-YAML comments using the
`extract_yaml.py` script. In this commit we move them to the codebase
but we don't use them yet, this will be done at a later commit for
the sake of readability.
Pietro Fezzardi