[glib] (8 commits) ...Merge branch 'ebassi/enum-type-macros' into 'main'

[Emmanuele Bassi <ebassi src gnome org>]

Summary of changes:

  9a4a10f... Add G_DEFINE macros for enum and flags types (*)
  2a9ef1e... Test the newly added G_DEFINE macros for enumeration types (*)
  28edd84... docs: Add the new G_DEFINE macros for enumeration types (*)
  6cbf7a7... Port enums tests to the appropriate assert functions (*)
  fa05ebe... docs: Mention alternatives for defining enumeration types (*)
  c0766ca... Use varargs for enum types definition macros (*)
  c4f9b92... Add versioning to the new macros (*)
  f389082... Merge branch 'ebassi/enum-type-macros' into 'main'

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