ribbon

- ADD: ribbon WPF control
- ADD: started to implement recent file list feature
recent files, ribbon, pictures, thread safety and cleanings

- ADD: finished implementing recent file feature
- ADD: recent files can be converted from strings and FileInfo objects
- ADD: thread safe version of ObservableCollection<T>
- ADD: started to implement insert picture preferences, like max picture
width or picture format
- UPD: buttons of ribbon bar
- CHG: cleanings
TMSynchronizedObservableCollection

- ADD: additional constructors for TMSynchronizedObservableCollection<T>