Cleanup: double quotes for non-enum strings

doc/manpage/blender.1.py

scripts/modules/bl_app_template_utils.py

...dules/bl_console_utils/autocomplete/complete_namespace.py

scripts/modules/bl_i18n_utils/bl_extract_messages.py

scripts/modules/bl_i18n_utils/utils.py

scripts/modules/bl_i18n_utils/utils_cli.py

scripts/modules/bl_keymap_utils/versioning.py

scripts/modules/bl_previews_utils/bl_previews_render.py

scripts/modules/bpy/utils/__init__.py

scripts/modules/bpy_extras/io_utils.py

scripts/modules/bpy_extras/node_shader_utils.py

scripts/modules/bpy_extras/wm_utils/progress_report.py

scripts/modules/bpy_types.py

scripts/modules/graphviz_export.py

scripts/modules/keyingsets_utils.py

scripts/modules/rna_info.py

scripts/startup/bl_operators/freestyle.py

scripts/startup/bl_operators/node.py

scripts/startup/bl_operators/object_quick_effects.py

scripts/startup/bl_operators/presets.py