Fix missing imports (#542)

printrun/settings.py

@@ -13,8 +13,13 @@
 # You should have received a copy of the GNU General Public License
 # along with Printrun.  If not, see <http://www.gnu.org/licenses/>.
 
+import logging
+import traceback
+
 from functools import wraps
 
+from .utils import parse_build_dimensions
+
 def setting_add_tooltip(func):
     @wraps(func)
     def decorator(self, *args, **kwargs):