Some UI improvements

- Bottom tab now only shows indices of active chat windows unless focused
- Always focus Home screen on startup instead of the last loaded conference
- Conference tab names are no longer prefixed with the conference number
- Home and Contact tab names are now capitalized

src/toxic.c

@@ -1501,6 +1501,7 @@ int main(int argc, char **argv)
 
     pthread_mutex_lock(&Winthread.lock);
     print_init_messages(prompt);
+    set_active_window_index(0);
     pthread_mutex_unlock(&Winthread.lock);
 
     cleanup_init_messages();