feat: add .gitignore for logs and refactor ServeSession to include path_roots in init_tree return

- Introduced a new .gitignore file to exclude log files from version control.
- Modified the `init_tree` function in `ServeSession` to return `path_roots`, enhancing the function's utility.
- Cleaned up commented-out code in `sourcemap.rs`, `patch_apply.rs`, and `tree.rs` for better readability and maintainability.

src/snapshot/patch_apply.rs

@@ -42,8 +42,6 @@ pub fn apply_patch_set(tree: &mut RojoTree, patch_set: PatchSet) -> AppliedPatch
 
     {
         profiling::scope!("updates");
-        // Updates need to be applied after additions, which reduces the complexity
-        // of updates significantly.
         for update_patch in patch_set.updated_instances {
             apply_update_child(&mut context, tree, update_patch);
         }
@@ -109,8 +107,6 @@ struct PatchApplyContext {
 #[profiling::function]
 fn finalize_patch_application(context: PatchApplyContext, tree: &mut RojoTree) -> AppliedPatchSet {
     for id in context.has_refs_to_rewrite {
-        // This should always succeed since instances marked as added in our
-        // patch should be added without fail.
         let mut instance = tree
             .get_instance_mut(id)
             .expect("Invalid instance ID in deferred property map");
@@ -181,7 +177,6 @@ fn finalize_patch_application(context: PatchApplyContext, tree: &mut RojoTree) -
             _ => continue,
         };
 
-        // Remove all Rojo ref-related attributes
         let keys_to_remove: Vec<String> = attributes
             .iter()
             .filter_map(|(name, _)| {

src/snapshot/tree.rs

@@ -125,28 +125,25 @@ impl RojoTree {
         //
         // We need to insert the NeedsPivotMigration property with a value of false on
         // every instance that inherits from Model for pivots to build correctly.
-        let hack_needs_pivot_migration = match snapshot.class_name.as_ref() {
-            // This is not a future proof way to do this but the last time a
-            // descendant of Model was added was in 2020 so it's probably fine.
+        let needs_pivot = match snapshot.class_name.as_ref() {
             "Model" | "Actor" | "Tool" | "HopperBin" | "Flag" | "WorldModel" | "Workspace"
-            | "Status"
-                if !snapshot
-                    .properties
-                    .contains_key(&ustr("NeedsPivotMigration")) =>
-            {
-                vec![("NeedsPivotMigration", Variant::Bool(false))]
-            }
-            _ => Vec::new(),
+            | "Status" => !snapshot
+                .properties
+                .contains_key(&ustr("NeedsPivotMigration")),
+            _ => false,
         };
 
         let is_script = is_script_class(snapshot.class_name.as_ref());
 
-        let builder = InstanceBuilder::empty()
+        let mut builder = InstanceBuilder::empty()
             .with_class(snapshot.class_name)
             .with_name(snapshot.name.into_owned())
-            .with_properties(hack_needs_pivot_migration)
             .with_properties(snapshot.properties);
 
+        if needs_pivot {
+            builder = builder.with_property("NeedsPivotMigration", Variant::Bool(false));
+        }
+
         let referent = self.inner.insert(parent_ref, builder);
         self.insert_metadata(referent, snapshot.metadata);