ClangTools: Query the tools for supported checks

...instead of hardcoding them for a particular version of
clang-tidy/clazy.

While at it, move also the tidy/clazy widgets to ClangTools as this
simplifies feeding data to them.

Reduce also the built-in configs to a single one using clang-tidy's and
clazy's default checks as they look very reasonable and saves us some
porting effort. Also, our previous built-in configs were just too
numerous.

Change-Id: Ib9297acb7810a940b86a23a8695530506a570394
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/clangtools/settingswidget.cpp

@@ -38,6 +38,8 @@
 namespace ClangTools {
 namespace Internal {
 
+static SettingsWidget *m_instance = nullptr;
+
 static void setupPathChooser(Utils::PathChooser *const chooser,
                              const QString &promptDiaglogTitle,
                              const QString &placeHolderText,
@@ -65,11 +67,17 @@ static void setupPathChooser(Utils::PathChooser *const chooser,
     });
 }
 
+SettingsWidget *SettingsWidget::instance()
+{
+    return m_instance;
+}
+
 SettingsWidget::SettingsWidget(ClangToolsSettings *settings, QWidget *parent)
     : QWidget(parent)
     , m_ui(new Ui::SettingsWidget)
     , m_settings(settings)
 {
+    m_instance = this;
     m_ui->setupUi(this);
 
     //
@@ -125,7 +133,20 @@ void SettingsWidget::apply()
     m_settings->writeSettings();
 }
 
-SettingsWidget::~SettingsWidget() = default;
+SettingsWidget::~SettingsWidget()
+{
+    m_instance = nullptr;
+}
+
+QString SettingsWidget::clangTidyPath() const
+{
+    return m_ui->clangTidyPathChooser->rawPath();
+}
+
+QString SettingsWidget::clazyStandalonePath() const
+{
+    return m_ui->clazyStandalonePathChooser->rawPath();
+}
 
 } // namespace Internal
 } // namespace ClangTools