Background color and text color should be changeable

Überblick über bereits bestehende Lösungen schaffen, die das gleiche Problem adressieren wollen.
Startpunkt könnte dieses Gist sein.

As a preparation for changing the calculated values of a single part later on, the user should be able to select a single part of the text and get a constant visual feedback about which part she selected.

If the user changes a value, the tool should give feedback if the new value exceeds a certain range.

The texts used for calculations (the 'wwwww's and 'iiiiii's) shouldn't be visible for the user. I'm not sure if the calculation still works when they are display:none. If not, they should just be moved far to the outside of the viewport.

By now, the values are calculated and they are used to render the example text, but they are never explicitly shown to the user. To make later changing possible, as a first step they should be displayed next to the example text.

Based on #11, the user should be able to change the displayed values for the selected part of text. Changes made by the user should be rendered immediately.

Die bisherigen Ergebnisse sollten schon mal in eine vernünftige Form (also Text) gebracht werden. Dazu müssen folgende Sachen gemacht werden:

• Latex setup
• Struktur für das Dokument
• Repo init
• Issue Template (?)

Based on #10, when a single part of the example text is selected, it should be possible for the user to see the calculated values for this part of the text.

The user should have at least some feedback on why the chosen value isn't ideal.

At the moment, the Font of the displayed text (#styled-text) is changed correctly. Also, calc() is called after changing the font to make sure all values fit the new font.
However, the font of the text used to calculate the correct width of the text is not changed, causing the width to be the same no matter the font.

$("#font-family").change(function() {
    var font = $("#font-family").val();
    $('#styled-text').css("font-family", font);
  })

Somewhere in here, the font has to be changed for the calculation elements as well.

Meilensteine validiert und nochmal weiter aufgesplittet.
Außerdem wird dieses Repo als Hub für das gesamte Projekt dienen, im Repo selbst das Dokument und andere Artefakte, im Wiki die groben Entwürfe, in den Issues die Milestones und tasks.