Generic highlighter: Add Creator's default folder for definitions.

share/qtcreator/generic-highlighter/README

+This is Creator's default directory for syntax highlight definitions.
+You can download them through the Generic Highlighter options dialog.

share/qtcreator/static.pro

@@ -33,7 +33,8 @@ DATA_DIRS = \
     qmldesigner \
     qmlicons \
     qml-type-descriptions \
-    qmljsdebugger
+    qmljsdebugger \
+    generic-highlighter
 
 !isEmpty(copydata) {
 

src/plugins/texteditor/generichighlighter/highlightersettings.cpp

@@ -134,10 +134,15 @@ void HighlighterSettings::fromSettings(const QString &category, QSettings *s)
     const QString &group = groupSpecifier(kGroupPostfix, category);
     s->beginGroup(group);
     m_definitionFilesPath = s->value(kDefinitionFilesPath, QString()).toString();
+    if (!s->contains(kDefinitionFilesPath))
+        m_definitionFilesPath = Core::ICore::instance()->resourcePath() +
+                                QLatin1String("/generic-highlighter");
+    else
+        m_definitionFilesPath = s->value(kDefinitionFilesPath).toString();
     if (!s->contains(kFallbackDefinitionFilesPath))
         m_fallbackDefinitionFilesPath = findDefinitionsLocation();
     else
-        m_fallbackDefinitionFilesPath = s->value(kFallbackDefinitionFilesPath,QString()).toString();
+        m_fallbackDefinitionFilesPath = s->value(kFallbackDefinitionFilesPath).toString();
     m_alertWhenNoDefinition = s->value(kAlertWhenDefinitionIsNotFound, true).toBool();
     m_useFallbackLocation = s->value(kUseFallbackLocation, true).toBool();
     if (!s->contains(kIgnoredFilesPatterns))