Switch view control and naming

[jancborchardt]

First off, the naming is confusing. It should be named »Slide view« and »Overview«.

The switch view control should be a contextual toggle:

• when you are in slide view, the button should say »Overview« (maybe with icon) and clicking on it should directly lead to the overview, no dropdown.
• when you are in overview, the button should say »Slide view« (maybe with icon) and clicking on it should directly lead to the slide view, no dropdown.

This also solves the issue that you don’t know in which view you are, even when you click to reveal the dropdown.