Blender Git Loki

fix [#30623] user-defined render presets bug

this report exposed multiple bugs in blender when using a non utf8 compatible home directory.

- bpy.utils.script_paths() would crash when homedir wasn't utf8 (reported bug)
- PyC_DefaultNameSpace() - would raise an error when running when __file__ was non utf8.
- preset filepath property was not set to accept non utf8.
- bpy.paths.display_name would raise an error on non utf8 paths, (used for preset draw)