Adds new dark current correction for hical (#4503)

* First commit of new file, "ZeroDarkRate.h" modeled after "ZeroDark.h" to introduce new algorithm for correcting for dark rate.

* Updated main.cpp and hical.XXXX.conf to enable use of the new module, ZeroDarkRate.h.

* Made changes to filenames and updated documentation about new module ZeroDarkRate.h

* Fixed a typo in the number of rows of the CSV files.

* Added logic to bail out with a user error if both ZeroDark and ZeroDarkRate are active in the
configuration file.

* Compiling and applying

* Changed temp to double

* Moved to a callable

* Updated gain call

* Swapped to use callable

* Moved to gtest

* Removed old app tests

* Moved dark rate test to gtest

* Changelog

* Updated hical docs

* Fixed comment tabbing

Co-authored-by: Other Orb / Moses Milazzo <moses@otherorb.net>