Snake case lint

[d-morrison]

Had to fix snake_case issues across all these files due to linked, reused documentation (via @inheritParams)

[codecov]

Codecov Report

Attention: Patch coverage is 69.23077% with 16 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
R/simresp.tinf.R	66.66%	5 Missing ⚠️
R/load_pop_data.R	33.33%	4 Missing ⚠️
R/sim.cs.multi.R	0.00%	4 Missing ⚠️
R/simulate_pop_data.R	75.00%	3 Missing ⚠️

Files with missing lines	Coverage Δ
R/as_curve_params.R	91.42% <100.00%> (+0.51%)	⬆️
R/df_to_array.R	76.47% <100.00%> (+76.47%)	⬆️
R/simcs.tinf.R	100.00% <100.00%> (+100.00%)	⬆️
R/simulate_pop_data.R	83.09% <75.00%> (ø)
R/load_pop_data.R	45.21% <33.33%> (-0.40%)	⬇️
R/sim.cs.multi.R	0.00% <0.00%> (ø)
R/simresp.tinf.R	90.21% <66.66%> (+90.21%)	⬆️

... and 6 files with indirect coverage changes

[github-actions]

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