Consistent structs

[phoebe-p]

Quite major changes in how information is passed to tmm_structure, rt_structure and rcwa_structure. All details such as incidence angles (always in radians), wavelengths (in m) and polarization are now passed through the 'options' dictionary, while only the information necessary to update the structure is required by init(). Also made the use of degrees/radians more consistent.

• [x] Fix the units of depth spacing to be consistent across methods.
• [x] Update docstrings and documentation explaining options.
• [x] Consistent function definitions for calculating profiles

[codecov[bot]]

Codecov Report

Merging #10 into devel will increase coverage by 2.61%. The diff coverage is 78.72%.

@@            Coverage Diff             @@
##            devel      #10      +/-   ##
==========================================
+ Coverage   64.64%   67.25%   +2.61%     
==========================================
  Files          19       19              
  Lines        2189     2220      +31     
==========================================
+ Hits         1415     1493      +78     
+ Misses        774      727      -47     

Impacted Files	Coverage Δ
rayflare/rigorous_coupled_wave_analysis/rcwa.py	53.41% <43.58%> (+1.19%)	:arrow_up:
rayflare/ray_tracing/rt.py	78.09% <70.00%> (+0.17%)	:arrow_up:
rayflare/transfer_matrix_method/tmm.py	90.68% <93.67%> (+16.15%)	:arrow_up:
rayflare/options.py	100.00% <100.00%> (ø)
rayflare/structure.py	88.09% <100.00%> (-0.28%)	:arrow_down:
rayflare/transfer_matrix_method/lookup_table.py	84.61% <100.00%> (+1.51%)	:arrow_up:

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