* Fixed compilation on linux and UE4.23
* Added string and enum type definition support
* Better handling or variable names, should avoid conflicts with reserved keywords or empty variable names in edge cases
* Updated samples
* Added the possibility for a codegen to set the location of the generated model files, similarly to API files.
* Removed std::shared_ptr from the generated types. Types in UE4Codegen are handled as POD structs, not shared pointers.
* Fixed handling of body parameters as per the specification, the single body object is written directly as the payload.
* Fixed handling of files and binaries, if a field is both isFile and isBinary, file will take precedence.
* Updated cpp-ue4 client samples
* Fixed handling of enums in models
Co-authored-by: William Cheng <wing328hk@gmail.com>
