Add multiple tab editor

[danipaniii]

Closes #1403 .

Since I did not want to spend a lot of time, fixing the dependency issues that arised in the fork of the other PR, I started to work on this Issue on my own Fork. Nevertheless while working on this issue I came across multiple challenges that are still work in progress. Here I made a list:

• The styling needs to be adjusted so that the editor will be shown in the tab.
• The styling needs to be adjusted, so that the TabView header is scrollable and it is possible to see the arrow buttons to move the header
• When selecting a file in the file tree, this file get's marked as selected, should we open a tab of another file in the TabView and make changes there, it will get seen as the file, that has been selected through the file tree, is where changes have been made. So when changing tabs, this selection should also change to the according file
• When selecting a file, somehow the code gets executed twice and the value of the file get's read in the second iteration
• When currently changing the tab, the activeIndex variable get's changed, but even after updating the TabView, the selected Tab is not changing. So I am thinking to implement it according to the documentation: https://primereact.org/tabview/. But therefore the const EditorView would have to become a function.

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