Move mouse and key actions to controller

[ZacZhangzhuo]

What type of change is this?

• [ ] Only move the mouse and key actions (and other relevant ones) from the view class to the controller class.
• [ ] The expandability (i.e., more actions, more key supports) is not possible yet. It will be available in the next version.

@Licini

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [x] I added a line to the CHANGELOG.md file in the Unreleased section under the most fitting heading (e.g. Added, Changed, Removed).
• [x] I ran all tests on my computer and it's all green (i.e. invoke test).
• [x] I ran lint on my computer and there are no errors (i.e. invoke lint).
• [ ] I added new functions/classes and made them available on a second-level import, e.g. compas.datastructures.Mesh.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [x] I have added necessary documentation (if appropriate)

[ZacZhangzhuo]

Few questions below. Also when I run an example, it raise error on the mouse due to the changes, plz make sure all examples still works accordingly : )

fixed by changing the code in selector:

                    x = self.app.controller.mouse.last_pos.x()
                    y = self.app.controller.mouse.last_pos.y()

[ZacZhangzhuo]

request a merge for the next step :) @Licini