Move Rojo server into root of the repository

src/serve_session.rs

@@ -0,0 +1,30 @@
+use std::collections::HashSet;
+
+use crate::{project::Project, session_id::SessionId};
+
+/// Contains all of the state for a Rojo serve session.
+pub struct ServeSession {
+    root_project: Option<Project>,
+    session_id: SessionId,
+}
+
+impl ServeSession {
+    pub fn new(root_project: Option<Project>) -> ServeSession {
+        let session_id = SessionId::new();
+
+        ServeSession {
+            session_id,
+            root_project,
+        }
+    }
+
+    pub fn session_id(&self) -> SessionId {
+        self.session_id
+    }
+
+    pub fn serve_place_ids(&self) -> Option<&HashSet<u64>> {
+        self.root_project
+            .as_ref()
+            .and_then(|project| project.serve_place_ids.as_ref())
+    }
+}