Update project to latest 2019.2

Changes:
* Update to 2019.2.20f1
* Clean up manifest.json

Additions:
+ Begin updating sample scene

Author: kerfuffles

Packages/com.chisel.core/Chisel/Core/API.private/Native/Plugin/x64/Chisel[TEST].exp.meta renamed to Assets/Sample Scene.meta

@@ -0,0 +1,372 @@
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