Make plotting kwargs a bit more uniform

[f0uriest]

• Renames some keyword arguments to plotting functions to have more consistent names, and adds some missing kwargs.
• Also renames all instances of zeta, nzeta, nphi to just phi, which can be a float, int, or array of toroidal angles to plot.

Resolves #420

[codecov]

Codecov Report

Merging #523 (0177562) into master (fcd2c0f) will increase coverage by 0.11%.
The diff coverage is 98.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #523      +/-   ##
==========================================
+ Coverage   94.09%   94.20%   +0.11%     
==========================================
  Files          75       75              
  Lines       17189    17195       +6     
==========================================
+ Hits        16174    16199      +25     
+ Misses       1015      996      -19     

Impacted Files	Coverage Δ
desc/plotting.py	88.65% <98.83%> (+1.41%)	⬆️
desc/utils.py	89.50% <100.00%> (+0.29%)	⬆️

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[rahulgaur104]

Seems straightforward.