traumar 1.2.4

• Added the functions to perform all data validation. These functions take the
  form of validate_*(), such as validate_character_factor(). After exploring
  options from other packages to lean on existing methods to validate data via
  functional programming, the decision was made to create functions "in-house"
  to avoid issues with adding another dependency. The validate_*() family of
  functions is not exported from traumar.

• Updated unit tests throughout the package given the addition of new data
  validation methodology.

• Ensured that plenty of comments are provided throughout the functions in the
  package to enhance understanding of the code and collaboration.

• pretty_number() now uses a digits argument instead of n_decimal.
  n_decimal has been deprecated and will now issue a warning, but the function
  will still work using the n_decimal argument. In a later release,
  n_decimal will be fully deprecated.

• rmm() and rm_bin_summary() will now fail if the seed argument is not of
  class numeric or integer.

• Added section headers throughout the code base to make navigation within most
  modern IDEs easier.

• Error/warning messages will now directly name the function in the call stack
  that is most helpful. For example, if some data validation triggers an error
  within traumar::seqic_indicator1(), then traumar::seqic_indicator1() will
  show up in the error message, instead of some other function such as a cli
  function or one of the new validate_*() functions.

• Improved small_count_label() code readability in the control flow chunk
  where values less than the cutoff are manipulated depending on user input.

• trauma_performance() now acts as a wrapper for trauma_case_mix() as
  trauma_performance() now calls trauma_case_mix() under the hood instead of
  explicitly performing the same operations. This makes the functionality more
  maintainable for any future iterations.