Code Cleanups and Minor Refinements

@Myoldmopar This is a non-urgent set of misc updates that can be reviewed when time allows. As requested, I separated this from more substantial revisions. It has passed my test suite with only the expected output fixups causing diffs.

The changes include:
 Automated pass to improve code consistency
 String literal breaks left over from F-to-C++ conversion removed
 String passing by value in some new code fixed
 Unnec trim() calls that appeared removed
 ProcessZoneData array args change from slices to references (faster)
 gio::Fmt const removed for reuse (faster)
 PlantPipingSystemsManager code refinements
 Misc minor code refinements