Vala 0.39.2
===========
 * Various bug fixes:
  - vala: Don't transform an explicit "null" into valid format-string [#791215]
  - codegen: Don't create null-safe destroy-wrapper for GenericType [#791283]
  - Improve error message for missing type-parameter on enclosing type [#587905]

 * GIR parser:
  - Allow change of parameter names
  - Handle metadata for fields inside a transparent union
  - Accept setters with boolean return-type as valid property-accessor
  - Don't mark simple-type out-parameters with '?' as nullable

 * Valadoc
  - libvaladoc: Actually resolve "percnt;" to '%'

 * Bindings:
  - glib-2.0: Fix potential null pointer dereference in string.joinv() [#791257]
  - gobject-2.0: Add missing GType constants for fundamentals [#791023]
  - gstreamer-1.0: Update from 1.13+ git master
  - gtk+-3.0: Switch to GIR [#730746]
  - gtk+-4.0: Update to 3.93.0+6af4947e
  - posix: Move signal constants to an enum and add few missing ones [#790958]