Reduce/review Citrus samples

The Citrus samples repository contains a vast amount of sample projects using Citrus’s Java and XML DSLs. The goal of these sample projects is to demonstrate how the functionality should be used . Over time the number of samples has grown so large that it is now quite confusing for new users. That is why we want to review the Citrus samples completely and create a set that reflects the main functionality of the framework while making them easy to understand and a good point to start from. To achieve this, we will focus on samples for the high priority modules and reduce the number of samples for low priority modules.