New collection creation form and minor improvements and bugfixes.

We noticed that for some of you, especially new users, creating collections caused problems. For this reason, we have decided to carry over the solution you know and love from our free generator allowing you to choose from three modes to define the format of the code depending on your preferences and level of expertise. We believe you will like this change.

In addition, we have made a number of improvements to the operation of the panel itself, and we have removed a few bugs that were making some of you uncomfortable.