Feature/knife edge directions

[syhaffert]

The Knife Edge coronagraph for multiple directions. A test has been added to check all directions and knife edge offsets.

[codecov[bot]]

Codecov Report

Merging #142 (4af8dbe) into master (058c473) will increase coverage by 1.04%. The diff coverage is 97.26%.

:exclamation: Current head 4af8dbe differs from pull request most recent head 2f60830. Consider uploading reports for the commit 2f60830 to get more accurate results

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
+ Coverage   79.57%   80.62%   +1.04%     
==========================================
  Files          94       94              
  Lines        6503     6848     +345     
==========================================
+ Hits         5175     5521     +346     
+ Misses       1328     1327       -1     

Impacted Files	Coverage Δ
hcipy/aperture/__init__.py	100.00% <ø> (ø)
hcipy/optics/detector.py	72.46% <ø> (+0.82%)	:arrow_up:
hcipy/version.py	83.33% <81.81%> (+5.55%)	:arrow_up:
hcipy/field/coordinates.py	76.84% <92.85%> (+3.59%)	:arrow_up:
hcipy/aperture/realistic.py	96.56% <98.50%> (+0.60%)	:arrow_up:
hcipy/aperture/generic.py	93.15% <100.00%> (+0.50%)	:arrow_up:
hcipy/config/config.py	87.87% <100.00%> (+1.51%)	:arrow_up:
hcipy/field/grid.py	81.31% <100.00%> (+2.83%)	:arrow_up:
hcipy/fourier/fast_fourier_transform.py	96.17% <100.00%> (+0.04%)	:arrow_up:
hcipy/fourier/fourier_transform.py	93.06% <100.00%> (ø)
... and 36 more

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[syhaffert]

This branch is failing on the windows pickle bug. I will need to rebase this PR.