This replaces the (de facto) singleton engines and data handlers by classes
that are instantiated per run. The DebuggerRunControl will now create an
object of (a class derived from) DebuggerEngine that contains all the relevant
"dynamic" data.

DebuggerManager is no more. The "singleton" bits are merged into DebuggerPlugin,
whereas the data bits went to DebuggerEngine.

There is no formal notion of a "current" DebuggerEngine. However, as there's
only one DebuggerEngine at a time that has its data models connected to the
view, there's still some "de facto" notion of a "current" engine. Calling
SomeModel::setData(int role, QVariant data) with custom role is used as the
primary dispatch mechanism from the views to the "current" data models
(and the engine, as all data models know their engine).

It'll be much saver to move to the qmldump based functionality once
it has been moved into Qt.

Essentially reverts: 45415783

Reviewed-by: Erik Verbruggen

Reviewed-by: kh1

the latter does too much

that way the users don't have to duplicate the connect everywhere.
as a side effect, MaemoPackageContents will have error reporting now.

externalize the error message and evaluation notification callbacks into
an own handler interface.

more types, and callback even for top-level project file

feature files are already generally excluded. add the explicitly
injected files (qmake.conf and .qmake.cache) to that. this makes
path-based exclusion superfluous.

Unit test cases were also created for this.

 ... otherwise the ASSERT will not trigger when it should.

the message manager is not thread-safe, so don't use it outside the main
thread.

Task-number: QTCREATORBUG-1673

Subclasses can override this method to do things when the mime-type is set/changed.

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>