Rework how we handle all modal dialogs

gui/utils/helpers_wxPython.py

@@ -2,9 +2,8 @@ import wx
 
 
 def YesNoDialog(question='Are you sure you want to do this?', caption='Yes or no?'):
-    dlg = wx.MessageDialog(None, question, caption, wx.YES_NO | wx.ICON_QUESTION)
-    result = dlg.ShowModal() == wx.ID_YES
-    dlg.Destroy()
+    with wx.MessageDialog(None, question, caption, wx.YES_NO | wx.ICON_QUESTION) as dlg:
+        result = dlg.ShowModal() == wx.ID_YES
     return result
 
 
@@ -25,4 +24,4 @@ def HandleCtrlBackspace(textControl):
         elif foundChar:
             break
     textControl.Remove(startIndex, curPos)
-    textControl.SetInsertionPoint(startIndex)
+    textControl.SetInsertionPoint(startIndex)