Interpolation refactoring

This is among other small things a refactoring of the interpolation

• Make textures less special (now subclasses of interpolator)
• Remove TextureCache
• (Ab-) use finite differences to enable spatial derivatives of interpolators
• enable code to use https://github.com/theHamsta/CubicInterpolationCUDA (not included into pystencils, not even as a submodule)

I can use it to transform Lenna and get gradients with Torch wrt. to image content, x-translation, y-translation

Also a nice image lenna

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• 4d413abf - Make assert error message more helpful

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• ced9b363 - Add _latex representation for InterpolatorAccess

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• 68777af3 - Let's not fake that we test gpu execution here

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• 85542671 - Improve implementation of Interpolator, TextureCachedField and add __eq__ for TextureDeclaration

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• f7c4c886 - Remove comment

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• 5c5cc012 - Make problems in textures hard errors

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added 45 commits

• 5c5cc012...46b7b88d - 15 commits from branch pycodegen:master
• 6af6b93f - Add InterpolatorAccess.__getnewargs__
• 07c87bc7 - Lint
• ee9587df - Allow differentation of InterpolatorAccess
• dd6b920e - Attempt to implement printing of DiffInterpolatorAccess
• ca17e888 - Re-add code for CubicInterpolationCUDA
• c6648fbb - Add DiffInterpolatorAccess.__repr__
• 06afa33d - use hashlib instead of hash for Interpolator
• 58985c02 - Add AssignmentCollection.atoms
• 1673ca3d - Remove test for unsupported feature
• 4c24729a - Enable Diff wrt to itself
• be54b20e - Express sorting shorter
• 479cc5ad - Refactor interpolation
• 2e85d1d1 - Remove TextureAccess
• a3f92cb4 - Implement interpolation as an optimization
• 7777156a - Add fd.Diff.interpolated_access
• 39fed6f8 - Add to docstring to fd.Diff.interpolated_access
• 477785f5 - Allow kwargs in fd.Diff.interpolated_access
• 064147b6 - Hash also interpolation_mode for InterpolatorAccess
• 6be6ba63 - Making cool stuff with interpolators
• 6acfc72a - Fix failing interpolation tests on newer sympy versions
• f645c192 - Remove unused import in `test_opencl`
• 995cc9ef - Big fat interpolation mode refactoring
• aa15fba9 - Add print statements to expm1-optimization test
• d03c3eea - Avoid re-initialization opencl context in test
• 1177d9a3 - Make assert error message more helpful
• 63bab1b2 - Add _latex representation for InterpolatorAccess
• 24f52f21 - Let's not fake that we test gpu execution here
• cd772ba1 - Improve implementation of Interpolator, TextureCachedField and add __eq__ for TextureDeclaration
• 8722a2b8 - Remove comment
• fa782b82 - Make problems in textures hard errors

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added 1 commit

• b20974fe - interpolation: Stuff is working let's commit quickly

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merged

mentioned in commit 1cabb407