Switch to a non-functional Rust skeleton

src/delta.rs

@@ -145,7 +145,7 @@ pub extern "C" fn purple_init_plugin(plugin: *mut PurplePlugin) -> i32 {
     let id = CString::new("prpl-delta").unwrap();
     let name = CString::new("Delta Chat").unwrap();
     let version = CString::new("0.1.0").unwrap();
-    let summary = CString::new("Delta Chat is an emai-based instant messaging solution").unwrap();
+    let summary = CString::new("Delta Chat is an email-based instant messaging solution").unwrap();
     let description = CString::new("See https://delta.chat for more information").unwrap();
     let author = CString::new("Nick Thomas <delta@ur.gs>").unwrap();
     let home_page = CString::new("https://delta.chat").unwrap();