* Pass "Part" instance to plugins when calling validate_serial_number
* Pass part instance through when validating IPN
* Improve custom part name validation
- Pass the Part instance through to the plugins
- Validation is performed at the model instance level
- Updates to sample plugin code
* Pass StockItem through when validating batch code
* Pass Part instance through when calling validate_serial_number
* Bug fix
* Update unit tests
* Unit test fixes
* Fixes for unit tests
* More unit test fixes
* More unit tests
* Furrther unit test fixes
* Simplify custom batch code validation
* Further improvements to unit tests
* Further unit test
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