Story 56019414: Removing "Delete Section" link in trees and restoring "Edit Section" which contains properly Permission-guarded Delete button
Story 56018666,56010498: Added tree view configurations in new style to show second levels for controls, objectives, and directive-sections on programs and directives pages
WIP for Story 55793538: added spinner to sections list while loading.  Causing crash bug, not properly styled yet
Story 55793538: Properly placed spinner and 'Loading...' text while Sections are loading in Directives tree
Merge pull request #280 from reciprocity/feature/p0-fixes

More P0 fixes for s10