Additional affines

[justusschock]

Short Description

This PR adds additional Affine Transformations. It mainly includes Transformations around the image center and a resizing trafo.

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Reviewer workflow

• Do all tests pass? (Unittests, NotebookTests, Documentation)
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• Are the tests useful? (!!!) Are additional tests needed?
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[mibaumgartner]

I would like to propose a different naming convention: the default behaviour should be the rotation around the image center (consistent to other frameworks) and the current rotation (from the master branch) should be renamed to something differently (e.g. RotationOrigin)

[justusschock]

And same for scaling?

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@b1aea08). Click here to learn what that means.
The diff coverage is 87.5%.

@@            Coverage Diff            @@
##             master      #29   +/-   ##
=========================================
  Coverage          ?   98.83%           
=========================================
  Files             ?       34           
  Lines             ?     1292           
  Branches          ?        0           
=========================================
  Hits              ?     1277           
  Misses            ?       15           
  Partials          ?        0

Flag	Coverage Δ
#unittests	98.83% <87.5%> (?)

Impacted Files	Coverage Δ
rising/utils/affine.py	100% <ø> (ø)
rising/loading/collate.py	100% <100%> (ø)
rising/transforms/affine.py	98.03% <100%> (ø)
rising/transforms/__init__.py	100% <100%> (ø)
rising/transforms/functional/affine.py	100% <100%> (ø)
rising/loading/loader.py	94.38% <85.29%> (ø)

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[justusschock]

Do you want to merge this despite the refactoring PR?

[mibaumgartner]

We need to undo my commit, rename the transforms, rename OriginMixin to something like CenterMixin and check the tests again
Not sure if we really need the origin transforms though .. but we could keep them if you want

[justusschock]

closed in favour of #31 and #32