DockIntoDensityMover refactor 01 (#5495)
Refactor poseSphericalSamples into DockIntoDensityUtils
This refactor will allow outside classes to access the density searching capabilities of the DockIntoDensity code
In anticipation of releasing some other code that uses this machinery I'm refactoring some parts of the DockIntoDensityMover to be functions rather than a class member functions so that other classes can use them. This is strictly a refactor and shouldn't change anything except the accessibility of some functions.