Multiple improvements

- Code "cleaning"
- Serialization for basic components (todo : rigidbody, should be easy)
- Octree bug fixed
- Start of animation integration (not working and dirty code, to continue)
- Lights position linked to link
- Sketch of Qt app for assets editor

There's still a lot of work to do but it's important to keep the master up to date

Close #259 Close #260

#### Important ! Update Cereal !