Python: Remove deprecated BGL API

The API was in a deprecation state for many years now.
This API was not compatible with Metal nor Vulkan.

This also remove `Image.bindcode`.

Pull Request: https://projects.blender.org/blender/blender/pulls/140370

doc/python_api/sphinx_doc_gen.py

@@ -267,7 +267,6 @@ else:
     EXCLUDE_INFO_DOCS = True
     EXCLUDE_MODULES = [
         "aud",
-        "bgl",
         "blf",
         "bl_math",
         "imbuf",
@@ -2033,7 +2032,6 @@ def write_rst_index(basepath):
     standalone_modules = (
         # Sub-modules are added in parent page.
         "aud",
-        "bgl",
         "bl_math",
         "blf",
         "bmesh",
@@ -2364,7 +2362,6 @@ def copy_handwritten_rsts(basepath):
 
     # TODO: put this docs in Blender's code and use import as per modules above.
     handwritten_modules = [
-        "bgl",  # "Blender OpenGl wrapper"
         "bmesh.ops",  # Generated by `rst_from_bmesh_opdefines.py`.
 
         # Includes.