[UX] - Control the visibility of attributes

[FelixKirsch]

What would you improve? With the introduction of attribute calculation, projects may contain a lot of different attributes. Some of these attributes might be quite long or not needed for any other tasks. Therefore, I propose to enable the user to select for each attribute if it should be visible on e.g. the labeling page. This is especially useful, if the uploaded data contains html data, out of which useful information is extracted using the attribute calculation. Then clearly only the extracted data is needed for the other tasks and it would improve the usability a lot if the user is not distracted by the other attributes.