Various fixes and cleanup for post-process pass

[adriengivry]

Description

• Bloom pass now outputs an alpha of 1.0f, preventing the post-process pass to finish with a framebuffer with alpha 0.0f if only bloom is enabled (resulting in the editor view displaying a transparent scene output)
• Updated auto-exposure effect and post-process pass to use the PingPongFramebuffer
• Re-ordered post-process stack component inspector settings to match pass order (auto-exposure --> bloom --> tonemapping --> FXAA)
• Fixed potential state leak between frames (pipeline state wasn't reset after the frame was completed)

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