Clang: Use the tree instead of the list for Clang-Tidy settings

List of checks does not give enough flexibility to
select/unselect specific checks. The tree fixes that.

Also remove Clang-Tidy checks line edit because it is
now integrated into the tree mode as an alternative way
of providing checks by pressing "Plain text edit" button.

'cpptools_clangtidychecks.h' is generated using python
script 'generateClangTidyChecks.py' and clang-tidy
from our LLVM/Clang 6.0 build.

Change-Id: I2ed1738cb2cbbf8dac6aba563469f06f69b11593
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

src/plugins/cpptools/clangdiagnosticconfigswidget.h

@@ -50,6 +50,8 @@ class ClazyChecks;
 class TidyChecks;
 }
 
+class TidyChecksTreeModel;
+
 class CPPTOOLS_EXPORT ClangDiagnosticConfigsWidget : public QWidget
 {
     Q_OBJECT
@@ -70,8 +72,7 @@ private:
     void onCopyButtonClicked();
     void onRemoveButtonClicked();
     void onClangTidyModeChanged(int index);
-    void onClangTidyItemChanged(QListWidgetItem *item);
-    void onClangTidyLineEdited(const QString &text);
+    void onClangTidyTreeChanged();
     void onClazyRadioButtonChanged(bool checked);
 
     void onDiagnosticOptionsEdited();
@@ -81,7 +82,7 @@ private:
     void syncOtherWidgetsToComboBox();
     void syncClangTidyWidgets(const ClangDiagnosticConfig &config);
     void syncClazyWidgets(const ClangDiagnosticConfig &config);
-    void syncTidyChecksList(const ClangDiagnosticConfig &config);
+    void syncTidyChecksToTree(const ClangDiagnosticConfig &config);
 
     void updateConfig(const CppTools::ClangDiagnosticConfig &config);
 
@@ -115,6 +116,7 @@ private:
 
     std::unique_ptr<CppTools::Ui::TidyChecks> m_tidyChecks;
     QWidget *m_tidyChecksWidget = nullptr;
+    std::unique_ptr<TidyChecksTreeModel> m_tidyTreeModel;
 
     int m_selectedConfigIndex = 0;
 };