Reorg dirs: reorganise `MaterilaItemUtils`

t.knopffrequested to merge
reorg_dirs into develop

In this MR mainly the source code found in GUI/Views/MaterialEditor/MaterialItemUtils.* was reworked to disentangle dependencies:

  • The non-GUI functions of MaterialItemUtils were moved to GUI/Models/MaterialItemUtils.*
  • The GUI functions (material related dialogs) were moved to GUI/Views/MaterialEditor/MaterialEditorUtils.*
  • One function to generate a random colour for materials was moved from GUI/Views/SampleDesigner/DesignerHelper.* to MaterialItemUtils.*
Edited by t.knopff

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