Add xyzmatrix2list xyzmatrix<-.list

[jefferis]

• should allow handling of arrow list of vectors
• includes tests

[codecov]

Codecov Report

Merging #485 (9daa715) into master (dd87d33) will increase coverage by 0.00%.
The diff coverage is 83.33%.

@@           Coverage Diff           @@
##           master     #485   +/-   ##
=======================================
  Coverage   75.67%   75.68%           
=======================================
  Files          48       48           
  Lines        5887     5893    +6     
=======================================
+ Hits         4455     4460    +5     
- Misses       1432     1433    +1     

Impacted Files	Coverage Δ
R/xyzmatrix.R	90.75% <83.33%> (-0.40%)	⬇️

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