Unity 2019.1 support

- Modified to use DrawProceduralNow instead of DrawProcedural on 2019.1.

Merge pull request keijiro#13 from keijiro/dev-vfxgraph

Add BakedPointCloud support

Add more data type support

- Added support for int8, uint8, int16, uint16, int32, uint32, float32, float64

Project settings

Add double precision support

Added PackageTool script.