Help: Move Help icons from Core to Help

These three images are only used in the Help plugin,
therefore they fit better into the Help resources.

Change-Id: I597494cc804e751d4f653bd7eb837a5f2f2e3b4b
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/help/help.qrc

@@ -6,6 +6,9 @@
         <file>images/next.png</file>
         <file>images/home.png</file>
         <file>images/bookmark.png</file>
+        <file>images/category_help.png</file>
+        <file>images/mode_help.png</file>
+        <file>images/mode_help@2x.png</file>
     </qresource>
     <qresource prefix="/trolltech/assistant" >
         <file>images/mac/addtab.png</file>

src/plugins/help/helpconstants.h

@@ -59,7 +59,7 @@ static const QLatin1String FontKey("font");
 const int  P_MODE_HELP    = 70;
 const char ID_MODE_HELP  [] = "Help";
 const char HELP_CATEGORY[] = "H.Help";
-const char HELP_CATEGORY_ICON[] = ":/core/images/category_help.png";
+const char HELP_CATEGORY_ICON[] = ":/help/images/category_help.png";
 const char HELP_TR_CATEGORY[] = QT_TRANSLATE_NOOP("Help", "Help");
 
 const char C_MODE_HELP   [] = "Help Mode";

src/plugins/help/helpmode.cpp

@@ -40,7 +40,7 @@ HelpMode::HelpMode(QObject *parent)
 {
     setObjectName(QLatin1String("HelpMode"));
     setContext(Core::Context(Constants::C_MODE_HELP));
-    setIcon(QIcon(QLatin1String(":/fancyactionbar/images/mode_Reference.png")));
+    setIcon(QIcon(QLatin1String(":/help/images/mode_help.png")));
     setDisplayName(QCoreApplication::translate("Help::Internal::HelpMode", "Help"));
     setPriority(Constants::P_MODE_HELP);
     setId(Constants::ID_MODE_HELP);