Was a bit confusing that a MakeStep was constructed by a
MakeBuildStepFactory and configured by a MakeBuildStepConfigWidget.
The MakeStep of the generic project manager was renamed to
GenericMakeStep.
Details: This enables us to parse the build errors correctly.
The makesteps of the qt4project and cmakeproject have some
code dupliaction, which could be refactored. And the code
to find out the correct build parser could probably also
be done better, but we are now parsing the build output for
cmake.
Details: These classes replace a number of classes with differing
interfaces by just one class. The design isn't quite perfect, but a lot
better than what it used to be. Also moved the ToolChain classes to the
projectexplorerm so that eventually the cmake plugin can also use them.
