Kexi/Junior Jobs/Add d-pointers

Goal

Improve internal APIs in Kexi. This can be done easily by introducing d-poitners to classes that lack them.

Read section about d-pointers on Techbase (d-pointers only, not shared d-pointers).

Classes that have to be converted are in this form:

// MyClass.h
class MyClass {
public:
 MyClass();
private:
 Foo m_foo;
};

// MyClass.cpp
MyClass::MyClass() {
 m_foo/doSomething();
}

After converting to d-pointer it should be:

// MyClass.h
class MyClass {
public:
 MyClass();
private:
 class Private;
 Private * const d;
};

// MyClass.cpp
class MyClass::Private {
public:
 Private() 
 Foo foo;
};

MyClass::MyClass()
 : d(new Private)
{
 d->foo.doSomething();
}

MyClass::~MyClass()
{
 delete d;
}

After converting to d-pointer:

any code referring to m_foo attribute should be changed to d->foo
if there is inline code in header file that uses member variable, do not move the variable to d-pointer unless you know for sure it isn't there for optimization

Basic Qt, average C++.

Please always emphasize importance of coding style to students and check that - it's so easier to maintain the style from day one instead of fixing afterwards. Show Techbase articles for that.
Take care of coding practices too (see Techbase articles)