[UNITYSDK-214] Fixes the multiple calls to propertyChanged
[UNITYSDK-215] null reference errors changed into valid error responses.
[UNITYSDK-215 amendments] IWebAPI.cs added as well (the auto-generated file).
[UNITYSDK-213] Occurences of the word 'occassionally' changed to 'occasionally'.
Update license year and named copyright holders
Remove unnecessary package.json file
Including NMock2.dll and license for testing
Update `Unity.Application` stub to support OpenURL and ExternalCall #tests
[UNITYSDK-244] Fix for Facebook shop item parsing
[UNITYSDK-245] Expose API host as editable field in Unity Editor
Fix response converter for Script call return values
[cleanup] Removing unused docs Makefile
Remove requirement to have pre-generated docs to build package
Renaming /webAPI to /_generator
Updating README.md to support latest workflows
Prepare v1.0.3 release package (changelogs, package, versions)
Merge v1.0.3 release