[vala] (17 commits) Non-fast-forward update to branch wip/issue/606

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/issue/606' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  dcf8735... WIP girwriter: Infer gir_namespace/version from target GIR 
  cf6494b... WIP build: Generate GIRs for libvala
  7abb469... WIP build: Check for valac with sufficient GIR support

Commits added to the branch:

  3af1cfb... codegen: Support GObject properties with nullable GType-bas (*)
  59eea90... girparser: Add support for string "ctype" metadata (*)
  14ea933... codegen: Always use G_TYPE_CHECK_INSTANCE_TYPE for external (*)
  5f979d8... gtk4: Update to 3.96.0+6a27fe15 (*)
  f7f5053... gstreamer: Update from 1.17.0+ git master (*)
  12123d2... vapi: Update GIR-based bindings (*)
  2d5dc1b... cogl-1.0: Fix out-params in Cogl.get_modelview_matrix/proje (*)
  d50c327... tests: Properties with NoAccessorMethod return heap-allocat (*)
  a6441ec... vala: No-accessor struct properties in GLib.Object class mu (*)
  9a5cc9e... vala: Trust "value_owned" when writing property getter (*)
  357042e... Regenerate GIR-based bindings to fix getter ownership of st (*)
  3971b25... Regenerate GIDL-based bindings to fix getter ownership of s (*)
  ef09730... clutter-1.0: Bind Margin, PaintVolume, Point, Rect and Size (*)
  a929a44... codegen: When freeing local variables don't stop at "switch (*)
  b1e29a4... WIP girwriter: Infer gir_namespace/version from target GIR 
  e9b5e34... WIP build: Generate GIRs for libvala
  46b6354... WIP build: Check for valac with sufficient GIR support

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