Combined Stage and Window class, and removed Stage class Change-Id: I1e7699c3b11c332195d4f8193626b48d8185ea6c
Remove Actor class and move Actor APIs into View Change-Id: I061e3b65c030dfaa4a3186414a1c35a633b77405
New directory structure for C# Change-Id: I418b9af4be2cdc92913da8a1e8ffeb6282961002