When a build was started after a build had errors, the error widget
would be made visible before it had a parent, leading to it being shown
as a top level for a split second.
So, clear the tasks before creating the new error widget, and assume
that we start without errors in the error widget.

* made them a few pixels smaller
* they now animate when collapsed
* they no longer fade out when an error is reported

Reviewed-by: thorbjorn

This should make the build bar a bit more
minimal. You can still click the panel to
access the results so no functionality is
lost.

Move the API to the progress manager.
Added a first Mac implementation, other
platforms are pending.

Mac OS X >= Leopard only.
Task-number: QTCREATORBUG-356

 * Incorporate new TaskWindow changes.

Reviewed-By: kkoehne

The category differs between e.g. TODO tasks, compiler errors/warnings,
qml syntax errrors ... Idea is that every plugin can manage it's
own virtual list of tasks.

Reviewed-by: dt

Also move Designer::Internal::FormWindowEditor ->
Designer::FormWindowEditor.

Reviewed-by: Trust Me

Conflicts:

	src/libs/cplusplus/CppBindings.cpp
	src/libs/cplusplus/CppBindings.h
	src/libs/cplusplus/FastPreprocessor.cpp
	src/libs/cplusplus/FastPreprocessor.h
	src/plugins/cpptools/cppcurrentdocumentfilter.cpp
	src/plugins/cpptools/cppcurrentdocumentfilter.h
	src/plugins/cpptools/cppsemanticsearch.cpp
	src/plugins/cpptools/cppsemanticsearch.h
	src/plugins/duieditor/parser/qmljs.g
	src/plugins/duieditor/parser/qmljsast.cpp
	src/plugins/duieditor/parser/qmljsast_p.h
	src/plugins/duieditor/parser/qmljsastfwd_p.h
	src/plugins/duieditor/parser/qmljsastvisitor.cpp
	src/plugins/duieditor/parser/qmljsastvisitor_p.h
	src/plugins/duieditor/parser/qmljsengine_p.cpp
	src/plugins/duieditor/parser/qmljsengine_p.h
	src/plugins/duieditor/parser/qmljsgrammar.cpp
	src/plugins/duieditor/parser/qmljsgrammar_p.h
	src/plugins/duieditor/parser/qmljslexer.cpp
	src/plugins/duieditor/parser/qmljslexer_p.h
	src/plugins/duieditor/parser/qmljsmemorypool_p.h
	src/plugins/duieditor/parser/qmljsnodepool_p.h
	src/plugins/duieditor/parser/qmljsparser.cpp
	src/plugins/duieditor/parser/qmljsparser_p.h
	src/plugins/duieditor/parser/qmljsprettypretty.cpp
	src/plugins/duieditor/parser/qmljsprettypretty_p.h
	src/plugins/duieditor/rewriter/rewriter.cpp
	src/plugins/duieditor/rewriter/rewriter_p.h
	src/plugins/duieditor/rewriter/textwriter.cpp
	src/plugins/duieditor/rewriter/textwriter_p.h
	src/shared/cplusplus/ASTClone.cpp
	tests/manual/cplusplus/main.cpp

Reviewed-by: Trust Me

Details:
-Centered all the text labels.
-Added shadow on title text.
-Made progressbar go all the way and placed the button on top.
-Added some spacing between warning and error icons.
-Improved cosmetics on progress bar itself.