kdeclarative: update to 5.108.0

5.99
  KeySequenceItem: Restore the previous value when it fails
  Remove project() calls from subdirs
  KeySequenceItem: Allow detecting when the key sequence is cleared
  KeySequenceItem: Use the helper's shortcut instead of duplicating them
  KeySequenceItem: Disable clear button when there's no key sequence
  KeySequenceItem: Cancel sequence recording when pressing the button
  KeySequenceItem: Remove workaround, it was addressed upstream
  KeySequenceItem: Show a cancel button when recording
  GridDelegate: show tooltip when `toolTip` is empty and title/caption is elided
  AbstractKCM: make footer top padding optional
  [kquickaddons/configmodule] Make getters const
5.100
  Make QQmlContext's contextObject outlive the QQmlContext
  Completely deprecate KDeclarative class
  Port manual test app away from deprecated KDeclarative API
5.101
  Deprecate unused parts of KWindowSystem import
  SimpleKCM: Account for flickable's margins when deciding to show separators
  Deprecate QIconItem
  Use const/let for JS variables as appropriate
  Sync header and footer separator code to SimpleKCM
5.102
  calendarevents: add new alternate date ready signal and deprecate the old one
  Support modifierOnlyAllowed in KeySequenceItem
5.103
  Remove unused QtGraphicalEffects import
  Fix anchors error in AbstractKCM & SimpleKCM types
  QML/JS: Prefer const over let, and use strict === equality
5.104
  Guard nullable property access, and bind instead of assigning once
  AbstractKCM: Rewrite padding expressions to be more readable
  Add import aliases, bump internal import versions as needed
  Drop unused QML imports
  [managedconfigmodule] Fix deprecation comments
  [configmodule] Deprecate constructor without metadata
  [configmodule] Deprecate setAboutData
5.105
  API dox: add some minimal docs to namespace & classes to trigger coverage
  API dox: cover CalendarEvents in generated QCH file
  Overhaul configmodule docs
5.106
  Guard nullable property access, and bind instead of assigning once
  CalendarEventsPlugin: fix wrong deprecation for signal alternateDateReady


(markd)