Change API enums to enum class, remove now redundant prefixing

* This gives a little nicer syntax, a bit better type safety, and also
  reflects better for SWIG bindings. Overall it's a minor change but
  better.
* We don't update the C# UI at all, since it's soon to be removed and
  not worth the effort/code churn.
* For now so we're ABI compatible with C#, all enums are uint32_t, but
  that is an obvious optimisation in future to reduce struct packing.
* We avoid 'None' as an enum value, because it's a reserved word in
  python so will cause problems generating bindings.

qrenderdoc/Code/RenderManager.cpp

@@ -293,14 +293,14 @@ void RenderManager::CloseThread()
   m_Thread = NULL;
 }
 
-ReplayCreateStatus RenderManager::ConnectToRemoteServer(RemoteHost *host)
+ReplayStatus RenderManager::ConnectToRemoteServer(RemoteHost *host)
 {
-  ReplayCreateStatus status =
+  ReplayStatus status =
       RENDERDOC_CreateRemoteServerConnection(host->Hostname.toUtf8().data(), 0, &m_Remote);
 
   m_RemoteHost = host;
 
-  if(status == eReplayCreate_Success)
+  if(status == ReplayStatus::Succeeded)
   {
     m_RemoteHost->Connected = true;
     return status;