Add static resources collection with pre-constructed QPixmaps & QIcons

* Apart from making the code cleaner when accessing them, creating these
  from strings can be slow if you do it often enough (e.g. once per
  resources for action/action_hover in pipeline state view).

qrenderdoc/Code/qrenderdoc.cpp

@@ -30,6 +30,7 @@
 #include <QStandardPaths>
 #include "Code/CaptureContext.h"
 #include "Code/QRDUtils.h"
+#include "Code/Resources.h"
 #include "Windows/MainWindow.h"
 
 void sharedLogOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg)
@@ -141,6 +142,8 @@ int main(int argc, char *argv[])
 
     config.SetupFormatting();
 
+    Resources::Initialise();
+
     GUIInvoke::init();
 
     CaptureContext ctx(filename, remoteHost, remoteIdent, temp, config);