myOmikron

Would be nice to have m2m relations with this syntax ``` #[derive(Model)] pub struct Repo { #[rorm(id)] pub id: i64, #[rorm(m2m, on_update = "Cascade", on_delete = "Cascade")] pub owners: Many2Many,...

**Is your feature request related to a problem? Please describe.** I'd like to have a custom Save function on CTRL + S but it opens the browser save dialog.