rewrite nearly complete

effects/fields/boolfield.cpp

@@ -92,5 +92,5 @@ void BoolField::UpdateFromWidget(bool b)
   SetValueAt(Now(), b);
 
   kdc->SetNewKeyframes();
-  olive::UndoStack.push(kdc);
+  olive::undo_stack.push(kdc);
 }

effects/fields/colorfield.cpp

@@ -67,5 +67,5 @@ void ColorField::UpdateFromWidget(const QColor& c)
   SetValueAt(Now(), c);
 
   kdc->SetNewKeyframes();
-  olive::UndoStack.push(kdc);
+  olive::undo_stack.push(kdc);
 }

effects/fields/combofield.cpp

@@ -87,5 +87,5 @@ void ComboField::UpdateFromWidget(int index)
   SetValueAt(Now(), items_.at(index).data);
 
   kdc->SetNewKeyframes();
-  olive::UndoStack.push(kdc);
+  olive::undo_stack.push(kdc);
 }

effects/fields/doublefield.cpp

@@ -143,7 +143,7 @@ void DoubleField::UpdateFromWidget(double d)
   if (!ls->IsDragging() && kdc_ != nullptr) {
     kdc_->SetNewKeyframes();
 
-    olive::UndoStack.push(kdc_);
+    olive::undo_stack.push(kdc_);
 
     kdc_ = nullptr;
   }

effects/fields/filefield.cpp

@@ -62,5 +62,5 @@ void FileField::UpdateFromWidget(const QString &s)
   SetValueAt(Now(), s);
 
   kdc->SetNewKeyframes();
-  olive::UndoStack.push(kdc);
+  olive::undo_stack.push(kdc);
 }

effects/fields/fontfield.cpp

@@ -89,5 +89,5 @@ void FontField::UpdateFromWidget(const QString& s)
   SetValueAt(Now(), s);
 
   kdc->SetNewKeyframes();
-  olive::UndoStack.push(kdc);
+  olive::undo_stack.push(kdc);
 }

effects/fields/stringfield.cpp

@@ -51,7 +51,7 @@ QWidget *StringField::CreateWidget(QWidget *existing)
     text_edit->setUndoRedoEnabled(true);
 
     // the "2" is because the height needs one extra pixel of padding on the top and the bottom
-    text_edit->setTextHeight(qCeil(text_edit->fontMetrics().lineSpacing()*olive::CurrentConfig.effect_textbox_lines
+    text_edit->setTextHeight(qCeil(text_edit->fontMetrics().lineSpacing()*olive::config.effect_textbox_lines
                                    + text_edit->document()->documentMargin()
                                    + text_edit->document()->documentMargin() + 2));
 
@@ -95,5 +95,5 @@ void StringField::UpdateFromWidget(const QString &s)
   SetValueAt(Now(), s);
 
   kdc->SetNewKeyframes();
-  olive::UndoStack.push(kdc);
+  olive::undo_stack.push(kdc);
 }