* Fixed valuetype parameters and discriminator deserialization
- Made non-required valuetypes nullable, and flagged required valuetypes as "x-csharp-value-type"
- Made sure to camelCase discriminator property names in Subtype converter
* Ran pet store sample script
* Ensure that readWriteVars and readOnlyVars are also marked as isEnum and isPrimitiveType where appropriate
* Updated petstore sample with enum fix
* Fields that are required should emit default values (otherwise the consuming API might throw a fit
* Added missing sample updated
* Re-ran petstore example script to grab all changes
* Rebased and re-ran example update script
* update csharp samples
Co-authored-by: William Cheng <wing328hk@gmail.com>