Removing the MCprep Optimizer

[StandingPadAnimations]

(mostly copied from #514 (comment))

MCprep 3.6 will remove the Cycles optimizer for the following reasons:

• Hasn't caught up with latest Cycles developments
• Algorithm is extremely buggy at times; there's been cases of it setting max bounces to values like 80. Ironically, I don't even use the optimizer (despite making it) for this very reason, and opt to manually optimize my scene
• Better tools exist for automatic optimization; the Super Image Denoiser devs at Pidgeon Tools have SFR, a Cycles optimizer that actually profiles the scene, making it far better then what we have.
• While the intent of the MCprep optimizer was to have something tuned specifically for Minecraft animation, I feel that over time, that became "how do we optimize a scene while not profiling, due to the average user's hardware?"

[TheDuckCow]

Marking this as closed, since the milestone branch has been completed. Will take effect in the next v3.6.0 release