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'

lib/Epub/Epub/blocks/TextBlock.cpp

@@ -165,7 +165,7 @@ void TextBlock::render(const EpdRenderer& renderer, const int x, const int y) co
     } else if (wordStyles[i] & ITALIC_SPAN) {
       fontStyle = ITALIC;
     }
-    renderer.drawText(x + wordXpos[i], y, words[i].c_str(), 1, fontStyle);
+    renderer.drawText(x + wordXpos[i], y, words[i].c_str(), true, fontStyle);
   }
 }