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   implement ^ and 0

Conflicts:
	src/plugins/debugger/procinterrupt.cpp

Conflicts:
	src/plugins/debugger/gdbengine.cpp

watch view update

Details:  We now get the system includes and system defines.

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.

Return early in this case.

Reviewed-by: Roberto Raggi

This reverts commits:

c721304a
885d908e
a0909989
fb4ad59d
0a9a67cf
0d1624d4
d018cfd5
0504fdd0
a2fd10fe

Conflicts:

	src/plugins/cpptools/cppcodecompletion.cpp

Reviewed-by: Roberto Raggi

Introduced UndefinedType class to replace null pointer.

Done with Roberto Raggi

RevBy:    As discussed with Nigel Hietala
Details:
The following changes have been applied:
* Mac now has hover on panel buttons and combo box
* More emphasis on combobox divider lines
* Arrow up/down is used for Mac/Gtk+ styles

These checks are necessary cause of a recent change in the C++ engine.

Reviewed-by: Roberto Raggi

    Details:  setCurrentEditor was sudddenly private