* [typescript] Clean up modelPropertyNaming across generators
Fixes https://github.com/OpenAPITools/openapi-generator/issues/2976
Generators without runtime models conversion use "original" property naming by default. It's still possible to change it via cli options
Generators with runtime conversion keep using "camelCase"
* Refactoring: use enum instead of string for modelPropertyNaming
* Restore the original camelCase for var names, decouple it from property names
* Swap toParamName and toVarName logic (looks like I've mistaken them)
* Regenerate docs
* Remove a no longer used private method
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