Full Rewrite for more flexibility (and bevy 0.10 update)

[laundmo]

I was not satisfied with the flexibility of this crate. Therefore, i've been working on rewriting it to be more flexible.

Implemented features:

• [x] kdtree
• [x] switch between manual, automatic or semi-automatic update modes.
  • [ ] semi-automatic is triggered by a event
  • [x] automatic is triggered by a timer
  • [x] manual only adds the resource
• [x] switch between using Transform an GlobalTransform for automatic mode
• [x] allow running the systems in a custom set, for run conditions, ordering and other purposes
• [x] add all systems without a base set, allowing them to be ordered in any Update, PreUpdate, PostUpdate etc.

Missing features/todo:

• [x] update all examples
• [ ] benchmark and optimise
• [x] rayon feature for kdtree
• [ ] rstar tree
• [x] clean up plugin (a plugin per datastructure?)

related:

• closes: #13
• closes: #12
• resolves: #19