…and encoders (#700)

### Motivation

In order to address #695 we made some targeted fixes (#696, #699) to use
explicit-self to avoid clashing with schema property names. This
addressed a clash with a specific variable with properties of only
certain schemas, but there are more places where we might encounter
future issues. Specifically, we have other variable names which might
cause a clash (e.g. `storage` and `discriminator`), and there are other
flavours of initializers, encoders, and decoders that were not updated
in the targeted fix.

In this PR, we update all access and assignment in the generated code
dealing with schemas to use explicit-self.


### Modifications

- Use self for member access and assignment in all initializers,
decoders, and encoders.
- Update the reference tests and snippet tests.

### Result

Removed some cases where valid OpenAPI docs would produce non-compiling
code.

### Test Plan

Snippet and reference tests. The latter is actually compiled during the
CI.

Enable MemberImportVisibility check on all targets. Use a standard
string header and footer to bracket the new block for ease of updating
in the future with scripts.

Update the release.yml file with the latest label changes

### Motivation

Implementation of #683.

### Modifications

- Implemented the SOAR-0013 idiomatic naming strategy
- Added name overrides
- Switched most reference tests to use the new strategy
- Updated some docs (I'll update the rest after this lands and gets
released, then I can update Examples and IntegrationTest)

### Result

SOAR-0013 implemented.

### Test Plan

Updated and added new unit tests.

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Co-authored-by: Si Beaumont <simonjbeaumont@gmail.com>
Co-authored-by: Si Beaumont <beaumont@apple.com>