Removed unnecessary EntityContainer member #1204

Job	Run time
Build for Windows using DirectX	8m 29s
Build for Windows using OpenGL	8m 21s
Build for macOS using Metal	1m 28s
Build for Ubuntu using OpenGL	3m 3s
Build for macOS using OpenGL	1m 23s
Build for Ubuntu (GLFW) using OpenGL	4m 46s
Build for iOS Xcode using Metal	3m 29s
Build for macOS Xcode using Metal	2m 21s
Build for Web (Emscripten) using WebGL 2	8m 50s
	42m 10s

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