Renamed SLTBoardLayer.layerId to token...
Added CLIENT property to SLTUnity

Conflicts:
	src/saltr/SLTUnity.cs
added implemented CLIENT property sending to SALTR
got rid of SLT2DLevel and SLTMatchingLevel, SLTLevel used instead
Merge branch 'updating-saltr-sdk' of https://github.com/plexonic/saltr-unity-sdk into updating-saltr-sdk
new namespaces according to directory structure,
some cleanup
minor improvement on saltr prefab