Add zoom to fit button

[eijawerner]

• Now possible to zoom to fit the whole graph
  • Avoid zooming in more than max limit for really small graphs, currently no limit for zooming out when pressing the zoom to fit button.
• Also added new icons for zoom in/out and fixed styling according to latest designs.
• Changed old icon buttons to have the same background states as in the new designs, however doesn't change the color yet, since the old icons are smaller and thinner it makes them more difficult to read. Remove the legacy color when all new icons are in place.
  (- NOT included: to be done in later PR, get the icons and color from design library when that is released)

New:

Old:

[OskarDamkjaer]

Is it possible to centre the graph taking the panel width into account? If it's expanded it looks a bit nicer having it be centred of the available space.
https://user-images.githubusercontent.com/10564538/151823616-43c5eff6-447e-4a3d-83d5-a30058cf42fd.mp4

[eijawerner]

Is it possible to centre the graph taking the panel width into account? If it's expanded it looks a bit nicer having it be centred of the available space. https://user-images.githubusercontent.com/10564538/151823616-43c5eff6-447e-4a3d-83d5-a30058cf42fd.mp4

I agree that it would be nice, however I'd like to keep the scope down of this PR and this is current behavior in Bloom as well, so I keep it as it is for now.