Replace FormatElement with ShaderConstant/ShaderVariableType

* FormatElement is now a static BufferFormatter class to help generate and parse
  buffer formatting strings

qrenderdoc/Code/CaptureContext.cpp

@@ -736,6 +736,8 @@ void CaptureContext::LoadCapture(const rdcstr &captureFile, const ReplayOptions
   {
     m_CaptureTemporary = temporary;
 
+    BufferFormatter::Init(m_APIProps.pipelineType);
+
     m_CaptureMods = CaptureModifications::NoModifications;
 
     rdcarray<ICaptureViewer *> viewers(m_CaptureViewers);