Every Plugin has been updated to correctly follow the same flow through the Scene lifecycle. Instead of listening for the Scene 'boot' event, which is only dispatched once (when the Scene is first created), they will now listen for the Scene 'start' event, which occurs every time the Scene is started. All plugins now consistently follow the same Shutdown and Destroy patterns too, meaning they tidy-up after themselves on a shutdown, not just a destroy. Overall, this change means that there should be less issues when returning to previously closed Scenes, as the plugins will restart themselves properly.
* Matter Physics now has a new config property `getDelta` which allows you to specify your own function to calculate the delta value given to the Matter Engine when it updates.
* Matter Physics has two new methods: `set60Hz` and `set30Hz` which will set an Engine update rate of 60Hz and 30Hz respectively. 60Hz being the default.
* Matter Physics has a new config and run-time property `autoUpdate`, which defaults to `true`. When enabled the Matter Engine will update in sync with the game step (set by Request Animation Frame). The delta value given to Matter is now controlled by the `getDelta` function.
* Matter Physics has a new method `step` which manually advances the physics simulation by one iteration, using whatever delta and correction values you pass in to it. When used in combination with `autoUpdate=false` you can now explicitly control the update frequency of the physics simulation and unbind it from the game step.
