ModelEditor: Apply some source code formatting rules

1. Reduce 2 or more empty lines to a single empty line
2. Remove duplicate access specifiers
3. Remove lots of single empty lines between member declarations
4. Remove braces around single lines
5. List base classes on same line as class declaration
6. Ensure opening brace of class declaration is on next line
7. Add comment to end of namespace block

Change-Id: I95e2efa3abea806683e0943d54d6f203ad4af0e4
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/libs/3rdparty/modeling/qmt/config/configcontroller.cpp

@@ -42,7 +42,6 @@
 
 #include <QDebug>
 
-
 namespace qmt {
 
 class ConfigController::ConfigControllerPrivate