Add back/forwards compatibility to schema validation (#1501)

* Allow future extensions of added schema objects

* Add explicit versioning to zod schemas

* Extend schema 0.4 with new fields in extras

- Allows Reroutes without using schema v1
- Reroute data is retained when using old versions - simply not displayed

* Add Reroute undo/redo support

src/scripts/changeTracker.ts

@@ -395,8 +395,11 @@ export class ChangeTracker {
         return false
       }
 
+      // Reroutes (schema 0.4)
+      if (!_.isEqual(a.extra?.reroutes, b.extra?.reroutes)) return false
+
       // Compare other properties normally
-      for (const key of ['links', 'groups']) {
+      for (const key of ['links', 'reroutes', 'groups']) {
         if (!_.isEqual(a[key], b[key])) {
           return false
         }