New code assist API

This is a re-work of our completion engine. Primary goals are:

- Allow the computation to run in a separate thread so the GUI is not locked.
- Support a model-based approach. QStrings are still needed (filtering, etc), but
internal structures are free to use more efficient representations.
- Unifiy all kinds of *assist* into a more reusable and extensible framework.
- Remove unnecessary dependencies on the text editor so we have more generic
and easily "plugable" components (still things to be resolved).

src/plugins/qt4projectmanager/qt4projectmanagerplugin.cpp

@@ -54,7 +54,7 @@
 #include "qtoptionspage.h"
 #include "externaleditors.h"
 #include "gettingstartedwelcomepage.h"
-#include "profilecompletion.h"
+#include "profilecompletionassist.h"
 
 #include "qt-maemo/maemomanager.h"
 #include "qt-s60/s60manager.h"
@@ -180,13 +180,7 @@ bool Qt4ProjectManagerPlugin::initialize(const QStringList &arguments, QString *
     addAutoReleasedObject(new SimulatorQtVersionFactory);
     addAutoReleasedObject(new WinCeQtVersionFactory);
 
-    ProFileCompletion *completion = new ProFileCompletion;
-    addAutoReleasedObject(completion);
-    // Set completion settings and keep them up to date
-    TextEditor::TextEditorSettings *textEditorSettings = TextEditor::TextEditorSettings::instance();
-    completion->setCompletionSettings(textEditorSettings->completionSettings());
-    connect(textEditorSettings, SIGNAL(completionSettingsChanged(TextEditor::CompletionSettings)),
-            completion, SLOT(setCompletionSettings(TextEditor::CompletionSettings)));
+    addAutoReleasedObject(new ProFileCompletionAssistProvider);
 
     // TODO reenable
     //m_embeddedPropertiesPage = new EmbeddedPropertiesPage;