bbfrederick/rapidtide: Version 2.4.3 - 3/30/22 checkpoint

(rapidtide) Some work on phase permutation for null correlation calculation. (happy) Put in the skeletons of some new features (upsampling, optical flow calculation). (OrthoImageItem.py) Removed the last of the obsolete pyqtgraph calls. (package) Attempting to modernize the packaging scripts to avoid deprecated behavior. (package) Several changes to fix the build environment