New features
* Added functions and documentation for numerous circumplex instruments.
* Added functions for ipsatizing and scoring item-level data.
* Added function for standardizing scale-level data using normative data.
Minor improvements and fixes
* Changed OpenMP flags in Makevars to fix a compile problem on Debian machines.
* Fixed a bug related to calculating angular medians in the presence of NAs.
* Changed the default to plot profiles with low fit (but with dashed borders).
* Import and export functions from rlang tidy evaluation.
* Added unit testing of various functions to increase code coverage.
* Redesigned package website to be more attractive and clear.
* Updated the SSM vignette to use the `standardize()` function.
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