#203 changed the window search such that a fancy intervall could be specified
#203 added code to setFancyIntervallInSearch(). It is not finished.
#203 iteration over letters
#203 modified setFancyIntervallInSearch()
#203 added yet another check if the intervall is correct in setFancyIntervallInSearch()
#203 changed typo in interval
#203 clean-up and added comments
Merge branch 'feature/203-fancy-intervall-search-stadtbilder' into dev