Move to smart pointers and split out ParsedText class (#6)

* Move to smart pointers and split out ParsedText class

* Cleanup ParsedText

* Fix clearCache functions and clear section cache if page load fails

* Bump Page and Section file versions

* Combine removeDir implementations in Epub

* Adjust screen margins

lib/GfxRenderer/GfxRenderer.h

@@ -1,11 +1,10 @@
 #pragma once
 
 #include <EInkDisplay.h>
+#include <EpdFontFamily.h>
 
 #include <map>
 
-#include "EpdFontFamily.h"
-
 class GfxRenderer {
  public:
   enum FontRenderMode { BW, GRAYSCALE_LSB, GRAYSCALE_MSB };