included only pkgs that are dependencies

See NOAA-FIMS/collaborative_workflow#63 (comment)

To make it clear this is an integration test.

by cleaning up the R code

Removes functions
* mkObj
* create_rcpp_interface_object
* use_module
* %>%
* FIMSFrameAge

Adds importFrom(TMB, MakeADFun) to package b/c TMB is no longer
explicitly used in the codebase. And, experimented with removing usethis
b/c it was also used in ./R/ but is still used in data-raw. It is now a
suggested package. Uses :: instead of importing functions, e.g.,
utils::head().

* Constricts line width to 80 characters
* Use full stops at the end of sentences
* Implement more spacing in between roxygen tags
* Move export tag to the end in most instances
* Use explicit brackets for if statements
* Remove duplicated code in gtest by calling run_gtest()
* Parameter and object names to snake_case
* Parameter, function, and object names, largely, w/o abbreviations

fix(run_gtest): Use paste() instead of paste0() to ensure proper spacing
which is not explicit in the instructions. With paste()
they can input as many additional arguments as they want and they are
all automatically separated, e.g.,
`run_gtest("--something", "--something-else")`

Close #588
Close #564
Close #590