Restructure GUI subdirectories to reduce cyclic dependencies

Joachim Wuttkerequested to merge
sf6 into develop
  • GUI/Models now has subdirectories
  • Item related files moved from GUI/Models to GUI/Items
  • Some directories moved directly under GUI/
  • GUI/Views/Toplevel collects files that were directly under GUI/Views/
  • GUI/main moved to App (out of GUI)
  • removed numerous two-way includes
  • corrected a few relative include paths
Edited by Joachim Wuttke

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