v0.4.0

• Support easier config overwrite (without having to dump the whole config).
• Rename custom field for node metadata to meta. (see here)
• Move icon to meta.icon. (see here)
• Rename normal_ui to default_ui. (see here)
• Rename filetypes to node_types. (see here)
• Split modes into modes.builtin and modes.custom (see here).
• Add the missing create file mode.
• Rename focused_ui to focus_ui (see here).
• Make version compatibility less annoying.
• Add key binding ~ to go to homedir.
• Add customizable cursor and prompts.
• Improve the help menus.