NEWS: update with some of the master-only changes.

As it involves some API changes and code moved from libgimp to core, I
just won't backport all the new rotation policy logics in gimp-2-10
branch. I could have cooked something up, at least to have new settings
in Preferences for updating the rotation policy (currently it's
implemented as a global parasite which is quite bad as it makes the
settings virtually non-updatable in a sane way) but really I don't want
to spend too much time on this. So let's just say it's GIMP 3
improvements.

NEWS

@@ -26,6 +26,20 @@ Core:
   - All code is year-2038-safe with deprecated time API replaced.
   - "Alpha to Selection" various actions warn when the result selection
     is empty.
+  - Color Profile Policy (import) now exposes a "Convert to Preferred
+    Profile" (fourth) choice and the import dialog default "Convert"
+    action will convert the image to the preferred profile (if any was
+    set, otherwise it falls back to the built-in profile). Converting to
+    the built-in profile will be still available as secondary action.
+  - A new "Metadata Rotation Policy" is now exposed in the Preferences
+    dialog, next to the "Color Profile Policy" (in page `Preferences >
+    Image Import & Export`) with 3 options: "Ask what to do", "Discard
+    metadata without rotating" and "Rotate the image then discard
+    metadata".
+    This policy used to be handled API-size, with a dialog generated by
+    libgimpui gimp_image_metadata_load_finish(), and saved in a global
+    parasite. The whole logics and GUI has been moved as core logics,
+    similar to the "Color Profile Policy".
 
 User Interface:
 
@@ -73,9 +87,10 @@ Plug-ins:
     ported to the new API.
   - Various objects are now proper GObject in the plug-in API, and not
     just ID integers.
-  - The API is GObject Introspected, which means plug-ins can be written
-    in various non-C languages. So far the following languages have been
-    tested and work well: Python 3, Lua, Javascript and Vala.
+  - The API is GObject Introspected into 2 modules: Gimp and GimpUi.
+    This means plug-ins can be written in various non-C languages. So
+    far the following languages have been tested and work well: Python
+    3, Lua, Javascript and Vala.
     (Note: Python 2 is also still working, but considering that this
     language is end-of-life since 2020, we don't really care).
   - Every introspected binding which we test comes with a "Goat
@@ -92,6 +107,32 @@ Plug-ins:
     extension).
     E.g.: `plug-ins/my-cool-plug-in/my-cool-plug-in.py`
 
+API:
+
+  - gimp_image_metadata_load_finish() is now fully GUI/GTK-code free.
+    The first consequence is that it is not in libgimpui anymore, but in
+    libgimp, as it should. The second consequence is that the boolean
+    `interactive` argument has been removed. Now all image rotation
+    logics (the part which needed a GUI) has been moved into core and
+    will be automatically run when normally loading images from GIMP's
+    interface, similarly as to how color profiles was already handled.
+  - 2 new libgimp API: gimp_image_policy_rotate() and
+    gimp_image_policy_color_profile() are now available to explicitly
+    call the Preferences-set policy on an image. This may result in a
+    dialog being presented to the user if `interactive` is TRUE and
+    settings is "Ask what to do".
+    It is unecessary to call these functions when developing a new
+    GimpLoadProcedure because the core will automatically do the right
+    thing and call these on normal image loading workflow.
+    Instead if a plug-in calls such GimpLoadProcedure through the PDB,
+    no such functions will be run automatically. It is up to the plug-in
+    to decide what to do (no conversion, mandatory conversion, or using
+    user settings, possibly with a dialog to decide, hence calling these
+    functions explicitly).
+  - All pygimp specific Python API does not exist anymore. Python will
+    use the same API as C plug-ins, introspected through GObject
+    Introspection.
+
 Documentation:
 
   - `devel-docs/xcf.txt` updated to handle XCF 14.