std::path::Path doesn't implement Reflect in 0.9

[Xion]

Code similar to the following used to work in 0.8.x:

use std::path::Path;

/// Path to the storage database.
#[derive(Clone, Copy, Debug, Default, Eq, Hash,  PartialEq, Reflect)]
pub enum StoragePath {
    /// In-memory database for testing.
    #[default]
    Memory,

    /// Database stored in an application- & platform-specific directory in the filesystem
    Filesystem(&'static Path),
}

In 0.9, it looks like &Path doesn't implement Reflect anymore (which would be a strange oversight), or at least the derive doesn't work correctly when a Path field is inside an enum variant.

[MrGVSV]

I think the main thing is adding the impl for Path itself. Not sure if that will handle the &Path case, but at least adds support for this missing type.