Move to SDK EInkDisplay and enable anti-aliased 2-bit text (#5)

* First pass at moving to SDK EInkDisplay library

* Add 2-bit grayscale text and anti-aliased rendering of text

* Render status bar for empty chapters

* Refresh screen every 15 pages to avoid ghosting

* Simplify boot and sleep screens

* Give FileSelectionScreen task more stack memory

* Move text around slightly on Boot and Sleep screens

* Re-use existing buffer and write to whole screen for 'partial update'

src/screens/FullScreenMessageScreen.h

@@ -2,23 +2,22 @@
 #include <string>
 #include <utility>
 
-#include "EpdFontFamily.h"
+#include <EInkDisplay.h>
+#include <EpdFontFamily.h>
 #include "Screen.h"
 
 class FullScreenMessageScreen final : public Screen {
   std::string text;
   EpdFontStyle style;
-  bool invert;
-  bool partialUpdate;
+  EInkDisplay::RefreshMode refreshMode;
 
  public:
   explicit FullScreenMessageScreen(EpdRenderer& renderer, InputManager& inputManager, std::string text,
-                                   const EpdFontStyle style = REGULAR, const bool invert = false,
-                                   const bool partialUpdate = true)
+                                   const EpdFontStyle style = REGULAR,
+                                   const EInkDisplay::RefreshMode refreshMode = EInkDisplay::FAST_REFRESH)
       : Screen(renderer, inputManager),
         text(std::move(text)),
         style(style),
-        invert(invert),
-        partialUpdate(partialUpdate) {}
+        refreshMode(refreshMode) {}
   void onEnter() override;
 };