Clang: add clang plugins checks to code model settings

Add UI controls to change settings and apply them
together with warnings and command line options.
Current settings are not very flexible but should be
easy to test and use without reading tidy/clazy help.

Change-Id: I1ca6b49a42a1169b34a703dd50de0bbc105df28f
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp

@@ -553,12 +553,54 @@ static QStringList warningOptions(CppTools::ProjectPart *projectPart)
     return CppTools::codeModelSettings()->clangDiagnosticConfig().commandLineWarnings();
 }
 
+static QStringList tidyCommandLine()
+{
+    const QString tidyChecks = CppTools::codeModelSettings()->tidyChecks();
+
+    if (tidyChecks.isEmpty())
+        return QStringList();
+
+    QStringList result;
+    result.append("-Xclang");
+    result.append("-add-plugin");
+    result.append("-Xclang");
+    result.append("clang-tidy");
+    result.append("-Xclang");
+    result.append("-plugin-arg-clang-tidy");
+    result.append("-Xclang");
+    result.append("-checks='-*" + tidyChecks + "'");
+    return result;
+}
+
+static QStringList clazyCommandLine()
+{
+    const QString clazyChecks = CppTools::codeModelSettings()->clazyChecks();
+
+    if (clazyChecks.isEmpty())
+        return QStringList();
+
+    QStringList result;
+    result.append("-Xclang");
+    result.append("-add-plugin");
+    result.append("-Xclang");
+    result.append("clang-lazy");
+    result.append("-Xclang");
+    result.append("-plugin-arg-clang-lazy");
+    result.append("-Xclang");
+    result.append(clazyChecks);
+    return result;
+}
+
 static QStringList commandLineOptions(CppTools::ProjectPart *projectPart)
 {
+    QStringList result;
     if (!projectPart || !projectPart->project)
-        return ClangProjectSettings::globalCommandLineOptions();
-
-    return ClangProjectSettings{projectPart->project}.commandLineOptions();
+        result.append(ClangProjectSettings::globalCommandLineOptions());
+    else
+        result.append(ClangProjectSettings{projectPart->project}.commandLineOptions());
+    result.append(tidyCommandLine());
+    result.append(clazyCommandLine());
+    return result;
 }
 
 static QStringList precompiledHeaderOptions(