Provide a Set of Different Waiting Times

[wurzelkuchen]

One thing we add often in customer projects is a set of different waiting times for different use cases (short waiting for hovers to open, medium for simple button clicks, long for complex pages to load...)

Since this is a recurring issue, we should add it to the library.

Requirements:

• add a useful default set of waiting times (e.g. standard, short, medium, double, long...)
• make those easily accessible for the user
• make those configurable
• add the possibility to add further individual waiting times