Re-design of submodules used in blender.git

This commit implements described in the #104573.

The goal is to fix the confusion of the submodule hashes change, which are not
ideal for any of the supported git-module configuration (they are either always
visible causing confusion, or silently staged and committed, also causing
confusion).

This commit replaces submodules with a checkout of addons and addons_contrib,
covered by the .gitignore, and locale and developer tools are moved to the
main repository.

This also changes the paths:
- /release/scripts are moved to the /scripts
- /source/tools are moved to the /tools
- /release/datafiles/locale is moved to /locale

This is done to avoid conflicts when using bisect, and also allow buildbot to
automatically "recover" wgen building older or newer branches/patches.

Running `make update` will initialize the local checkout to the changed
repository configuration.

Another aspect of the change is that the make update will support Github style
of remote organization (origin remote pointing to thy fork, upstream remote
pointing to the upstream blender/blender.git).

Pull Request #104755

source/blender/python/intern/bpy_operator.c

@@ -7,7 +7,7 @@
  * the ability to inspect and call operators (defined by C or Python).
  *
  * \note
- * This C module is private, it should only be used by `release/scripts/modules/bpy/ops.py` which
+ * This C module is private, it should only be used by `scripts/modules/bpy/ops.py` which
  * exposes operators as dynamically defined modules & callable objects to access all operators.
  */
 
@@ -64,7 +64,7 @@ static void op_context_override_deprecated_warning(const char *action, const cha
 {
   if (PyErr_WarnFormat(
           PyExc_DeprecationWarning,
-          /* Use stack level 2 as this call is wrapped by `release/scripts/modules/bpy/ops.py`,
+          /* Use stack level 2 as this call is wrapped by `scripts/modules/bpy/ops.py`,
            * An extra stack level is needed to show the warning in the authors script. */
           2,
           "Passing in context overrides is deprecated in favor of "