docs: update changelog with stuff we've been doing

CHANGELOG.md

@@ -10,3 +10,46 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - This CHANGELOG file! It's time we start keeping track of what we have done.
+- Serialization system based on reflection (#435).
+- Trait for describing enum types under reflection (#579).
+- New JSON asset bridge based on the new serialization system (#856).
+- Relations to the ECS (#656, also, there's a blog post on this!).
+- Queries which can be built dynamically (#882).
+- Broadphase collision detection for boxes and capsules (#905).
+- Physics plugin which for now only implements particle physics (#200).
+- Bootstrap the Gizmo plugin (#512).
+- Transform gizmo, used to move selected entities (#213)
+- Free camera controller plugin (#720).
+- Split screen plugin, which sets the viewports of active cameras automatically (#760).
+- Screen picker plugin (#868).
+- Entity picking through the entity selector plugin (#871).
+- Toolbox plugin, which manages other TESSERATOS windows (#519).
+- Voxel palette editor plugin (#662).
+- Scene editor plugin (#265, #551).
+- Metrics panel plugin, which only shows FPS statistics for now (#275).
+
+### Changed
+
+- Start using reflection on most of the ECS (#462).
+- Change the ECS to be archetype-based (#819)
+- Move the Cubos class to the core (#900).
+- Switch to new system syntax (#896).
+
+### Deprecated
+
+- Template-based serialization system (#571).
+- Bridges based on the deprecated serialization system (#436).
+
+### Removed
+
+- `quadrados-gen`, as we no longer need code generation with the new reflection-based ECS (#849).
+- Dependency on `spdlog` and `fmt` (#830).
+
+### Fixed
+
+- Engine tests are now compilable and run in the CI (#566).
+- Crash when selected entity is destroyed (#477).
+- Crash when using OpenGL < 4.3 (#740).
+- Bug where other PRs doc previews are deleted when you merge a single PR (#563).
+
+[unreleased]: https://github.com/GameDevTecnico/cubos/commits/main/