Add string messages to returned result codes to display to user

* Most of the main entry points that can fail with relevant reasons now has a
  way of specifying a message to return with it. This message can be displayed
  to the user to give more information or context about an error.

qrenderdoc/Code/pyrenderdoc/qrenderdoc_stub.cpp

@@ -187,14 +187,14 @@ void RemoteHost::CheckStatus()
 {
 }
 
-ReplayStatus RemoteHost::Connect(IRemoteServer **server)
+ResultDetails RemoteHost::Connect(IRemoteServer **server)
 {
-  return ReplayStatus::Succeeded;
+  return {ResultCode::Succeeded};
 }
 
-ReplayStatus RemoteHost::Launch()
+ResultDetails RemoteHost::Launch()
 {
-  return ReplayStatus::Succeeded;
+  return {ResultCode::Succeeded};
 }
 
 bool RemoteHost::IsServerRunning() const