Use rdc types instead of Qt containers in public QRenderDoc interface

* This is to support python bindings - the pyside implementation of
  QVector, QString, etc is not available to SWIG, so SWIG treates these
  all as opaque types.
* Rather than trying to set up bindings that work for rdcarray and
  QList/QVector, or implementing separate bindings, we instead just say
  that the public interface must use the rdc types. In most cases they
  seamlessly convert to/from Qt types anyway.
* In a couple of places we use an array of pairs instead of a map. In
  future we probably want an rdcdict or rdcmap with proper dict bindings
  in python.

qrenderdoc/Code/Interface/QRDInterface.cpp

@@ -88,7 +88,7 @@ CaptureSettings::operator QVariant() const
   ret[lit("CmdLine")] = CmdLine;
 
   QVariantList env;
-  for(int i = 0; i < Environment.size(); i++)
+  for(int i = 0; i < Environment.count(); i++)
     env.push_back(EnvModToVariant(Environment[i]));
   ret[lit("Environment")] = env;
 
@@ -144,7 +144,7 @@ CaptureSettings::CaptureSettings(const QVariant &v)
   Options.DebugOutputMute = opts[lit("DebugOutputMute")].toBool();
 }
 
-QString configFilePath(const QString &filename)
+rdcstr configFilePath(const rdcstr &filename)
 {
   QString path = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);