ModelEditor: Apply naming convention to types

Use Pascal style for typedefs and class instead of struct.

Change-Id: Ib568994e70c8ac0a219b2fba1d998e04ef5f79da
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

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

@@ -45,8 +45,9 @@
 
 namespace qmt {
 
-struct ConfigController::ConfigControllerPrivate
+class ConfigController::ConfigControllerPrivate
 {
+public:
     ConfigControllerPrivate()
         : m_stereotypeController(0)
     {