invite User to Chat
exception handling added
New Class for Client-Settings. Refactored
New Classes for Settings, Info and Main-Window. Contact-List loaded into Main-Window
print exception message in errors & small fixes
refactored and bugfixes
remove Buttons from ContactList
merged
add Contact-Button to List in Main-Window
stub removed
Began to init new chat from MainWindow
Merge branch 'ChatManager' of https://github.com/sepm-depm/sepm-group into ChatManager
added Settings button to login window
connected Settings-button to slot
minor bugfixes
Merge branch 'ChatManager' of github.com:sepm-depm/sepm-group into ChatManager
error messages updated
added settings to login-window
Merge branch 'ChatManager' of https://github.com/sepm-depm/sepm-group into ChatManager
added new constructor for notifications in login-window