[REQUEST] Zoom to model

[pjanck]

Is your feature request related to a problem? Please describe.
I would like to have a button (similar to house button) that centers the model on screen and fills the screen (zooms to fill up the viewport). The house button also rotates - without that.

Describe the solution you'd like
A button that does the same as the house button, without the rotation. Similar functionality is for example available in AutoCAD, "Zoom, all".

When adding, please update the wiki page about Camera control as well.

Describe alternatives you've considered
Perhaps only a change of the house button could suffice?

Additional context
This function should be available to all visual unit tests, in order to center the model every time a view direction is changed.