update plot and rasterize functions

[CagtayFabry]

Changes

• geometry.Profile.rasterize can return list of rasterized shapes
• geometry.Profile.plot plots individual line objects for each shape (instead of a single line object)

Related Issues

Closes # (add issue numbers)

Checks

• updated CHANGELOG.md
• updated tests
• updated doc/
• update example/tutorial notebooks

[codecov]

Codecov Report

Merging #223 (2dbad49) into master (0a864d5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #223   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files          69       69           
  Lines        3851     3856    +5     
=======================================
+ Hits         3841     3846    +5     
  Misses         10       10           

Impacted Files	Coverage Δ
weldx/geometry.py	100.00% <100.00%> (ø)
weldx/transformations.py	99.38% <100.00%> (+<0.01%)	⬆️

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[CagtayFabry]

thanks for looking over this @vhirtham 🚀
I realized later I could probably just loop over the shapes in my code just as well.. 😄 But it simplifies things a bit

We can take a more in-depth look at this in #197 again