Add a 'Numérotation auto' tab to the global settings page (Settings >
Nouveau projet) where users can define default auto-numbering rules
for Conducteurs, Eléments, and Folios. These rules are automatically
transferred to every new project created.
Changes:
- Add NumerotationContext::saveToSettings()/loadFromSettings() static
helpers for persisting named numerotation contexts via QSettings
- Add 'Numérotation auto' tab to NewDiagramPage with three sub-tabs
using SelectAutonumW widgets (same UI as project properties)
- Add save/remove/persist slots for conductor, element, and folio
contexts with immediate QSettings persistence on every change
- NewDiagramPage::applyConf() saves autonum settings when editing
global defaults (no project)
- QETProject constructor loads global autonum settings from QSettings
for new empty projects