Updated dependencies to latest CppSharp.
Merge pull request #2648 from SickheadGames/cppsharp

CppSharp Update
Fixed iOS NumericOverFlow Exceptions for color.cs and constantbuffer.PlatformInitialize
Fixed xml namespaces.
Added xml to assets project.
Changed  to unchecked instead of bitmask and MathHelper.
Fixed incorrect public access.
Added missing ContentSerializerCollectionItemNameAttribute.
Merge pull request #2654 from SickheadGames/access

Access & ContentSerializerCollectionItemNameAttribute
Merge branch 'develop' into intermediate
Fixed some missing types.
Added intermediate deserializer unit tests.
Merge pull request #2655 from SickheadGames/intermediate

Intermediate Deserializer Unit Tests
Merge pull request #2650 from josant/iosmathfixes

Fixed iOS NumericOverFlow Exceptions
Merge back from develop
Try to be a bit safer with addInstance events.