Reshape window for editing of views

[Zack-83]

Rationale / Begründung

The new platform for views editing is much better than the previous one! One remaining difficulty is that source documents tend to be long, thus hiding the buttons to save, which are at the very bottom.

Affected

Managers

Minimal functionality

Either push the buttons up, or define a fixed height for the code window (but keeping the focus on the same code line upon saving).

Nice-to-have functionality

The page might be further improved by importing the functionalities of a text editor such as Atom or Notepad++ (code alignment, prettifying, tag matching, ...) or the ones by an IDE like RStudio.

[jochenklar]

There is also a save button at the top of the page. But maybe we need the buttons in the sidebar. I am hesitant to give a fixed height, since this would introduce a second scroll bar, which is horrible. About the IDE functions: I think this is a loosing game since we will never be able to be as comfortable as notepad++. We could also try to enable keyboard shortcuts. I am pressing ctrl-s all the time anyway.