Revert "Added functional pushback, and destuctable enviroment."

This reverts commit ca307e19e2f67c66cc1ac11cadb3a4b4a58fff73.

Conflicts:
	Library/CurrentLayout.dwlt
	Library/ScriptAssemblies/Assembly-CSharp-Editor.dll
	Library/ScriptAssemblies/Assembly-CSharp-Editor.dll.mdb
	Library/ScriptAssemblies/Assembly-CSharp.dll
	Library/ScriptAssemblies/Assembly-CSharp.dll.mdb
	Library/assetDatabase3
	Library/metadata/46/46760828929d33d4caf957a16bf02fbc
	Library/metadata/c6/c659c9a30807fdf40adcd1c96cab1cad