Re-organise external-facing headers to be more easily used

* renderdoc/api/replay/ contains all the headers for using the replay and
  analysis side of renderdoc (like in a UI or auto-testing tool)
* renderdoc/api/app/ contains the headers if you wanted to write a
  renderdoc-aware application.

renderdoc/replay/entry_points.cpp

@@ -28,7 +28,7 @@
 #include "serialise/serialiser.h"
 #include "core/core.h"
 #include "replay/replay_renderer.h"
-#include "replay/renderdoc.h"
+#include "api/replay/renderdoc_replay.h"
 
 extern "C" RENDERDOC_API float RENDERDOC_CC Maths_HalfToFloat(uint16_t half)
 {
@@ -97,7 +97,7 @@ void RENDERDOC_CC RENDERDOC_LogText(const wchar_t *text)
 }
 
 extern "C" RENDERDOC_API
-const wchar_t* RENDERDOC_CC RENDERDOC_GetLogFilename()
+const wchar_t* RENDERDOC_CC RENDERDOC_GetLogFile()
 {
 	return RDCGETLOGFILE();
 }