When a change is done to an element that cannot be changed due to
debugger/qdeclarative limitations, a warning is shown to the user in QML
JS Editor.

Reviewed-by: Olivier Goffart

see 576642a7 for details

This one should be called when a component is changed and components
using it need to be reloaded.

isAvailable() returns true if a Quick ToolBar is available
for that node

The parameter force now forces the activation of the Quick
ToolBar even if it is not shown by default (enabled).

Also, update the gray mask that appears when user enters context of some
item. The mask is grown if the item changes its geometry, but never
shrunk, as this would introduce annoying flicker on the screen.

The crumble path shows the current context of the debugger/inspector.

Reviewed-by: ckamm

Using more *::Constants::ICON_* where it makes sense and
wrapping the file names into QLatin1String where they were
missing.

The increased usage of the ICON constants needed a few more
cross plugin includes of *constants.h, here and there.
I think that it is OK, since the dependencies were alredy there
icon resource wise.

Reviewed-by: Erik Verbruggen

This allows us to quickly switch between std::tr1::shared_ptr and
QSharedPointer. The latter is the default now because of problems
with shared_ptr in certain compilers.

Reviewed-by: Bill King

This widget has little to do with the QML debugging library, and will be
reused inside the QML JS Inspector UI as well.

Now the style is something similar to Qt Creator's default coloring.