Some optimizations

[m-seker]

Summary

Use implicit sharing for Image data to eliminate redundant copies.

PS : A quick profiling says that we spend most of our time during ImageResampler::process(), it is mostly color conversion code. We can vectorize that code but portability is a concern. Maybe we can start with common SIMD instruction sets and fallback to normal for others. I did a quick test and my VM takes approximately 500us to resample the image. I tried implementing it with AVX2 and it is now around 50us.

Al in all, those number are no concern at all but optimization is always fun.

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• Bugfix
• Feature
• Code style update
• Refactor
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Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing setups:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's body (e.g. Fixes: #xxx[,#xxx], where "xxx" is the issue number)

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Other information:

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[m-seker]

This saves a bunch of copies

[m-seker]

This saves a bunch of heap allocations

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[Paulchen-Panther]

Merge?