[vala] (17 commits) ...vala: Micro optimizations

[Rico Tzschichholz <ricotz src gnome org>]

Summary of changes:

  9a0cc13... gstreamer: Update from 1.17.0+ git master (*)
  7a1f0b3... gtk4: Update to 3.96.0+bcea9652 (*)
  469d043... gtk4: Constructors of Gtk.MediaFile needs to be static func (*)
  7d317eb... vala: Let methods return an unowned reference to internal c (*)
  4ed61d4... vala: Let DataType.get_return_type() return an unowned refe (*)
  2b00c99... vala: Return unowned references of internal helper symbols (*)
  061c02a... vala: Rename DataType.data_type property to DataType.type_s (*)
  a6bdd4c... codegen: Follow rename of DataType data_type property to ty (*)
  72b187a... valadoc: Follow rename of DataType data_type property to ty (*)
  7f40ed8... vala: Micro optimizations for SemanticAnalyzer (*)
  1618e76... vala: Micro optimizations for MethodCall (*)
  740b5db... vala: Micro optimizations for MemberAccess (*)
  2be23ae... vala: Micro optimizations for Assignment (*)
  29a3cae... vala: Unify backing symbol instance of data-types (*)
  f01dde8... vala: Move common implementations to CallableType (*)
  325c81d... vala: Drop DelegateType.to_qualified_string() which is dupl (*)
  9811ebe... vala: Micro optimizations (*)

(*) This commit already existed in another branch; no separate mail sent