Themed Icons: Introduce Utils::Icon

Instead of describing icons via file name or in the themed icons case
via
a string that is a list of mask/color pairs, we have now a class for it.

Icons are now listed in per-plugin *icons.h headers.

RunControl::m_icon was The only place left where an icon property was in
fact a string. This patch changes that member to be a Utils::Icon.

Change-Id: Ibcfa8bb25e6d2e330c567ee7ccc0b97ead603177
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/debugger/stackhandler.cpp

@@ -32,6 +32,7 @@
 
 #include "debuggeractions.h"
 #include "debuggercore.h"
+#include "debuggericons.h"
 #include "debuggerengine.h"
 #include "debuggerprotocol.h"
 #include "simplifytype.h"
@@ -59,8 +60,8 @@ namespace Internal {
 
 StackHandler::StackHandler(DebuggerEngine *engine)
   : m_engine(engine),
-    m_positionIcon(QIcon(QLatin1String(":/debugger/images/location_16.png"))),
-    m_emptyIcon(QIcon(QLatin1String(":/debugger/images/debugger_empty_14.png")))
+    m_positionIcon(Icons::LOCATION.icon()),
+    m_emptyIcon(Icons::EMPTY.icon())
 {
     setObjectName(QLatin1String("StackModel"));
     m_resetLocationScheduled = false;