epidemics v0.3.0

[pratikunterwegs]

This PR is working towards a v0.3.0 release by checking off items in #216.

[pratikunterwegs]

Some issues thrown up that are worth keeping in mind:

1. R CMD check requires RcppEigen to be in Imports, but devtools::check(remote = TRUE, manual = TRUE) throws a note that it should "probably only be in LinkingTo", but this addition is IIRC autogenerated by {usethis};
2. LaTeX issues throw up a warning;
3. ‘epidemics-manual.tex’ is generated at some point which throws a note;
4. https://opensource.org/license/mit/ connection times out on some networks, throwing a note;
5. HTML version of the manual on MacOS throws issues which generate a note.

[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 376cc99 is merged into main:

• ✔️default_ode: 10.8ms -> 10.7ms [-2.28%, +0.26%]
• ✔️default_ode_interventions: 73.8ms -> 73.6ms [-1.27%, +0.88%]
• ✔️default_ode_param_vec: 825ms -> 825ms [-0.68%, +0.74%]
• ✔️default_ode_paramvec_intervs: 6.27s -> 6.26s [-0.72%, +0.44%]
• ✔️ebola: 623ms -> 625ms [-0.63%, +1.1%]
  Further explanation regarding interpretation and methodology can be found in the documentation.