Use sane smaller data types for data in section.bin (#188)

## Summary

* Update EpdFontFamily::Style to be u8 instead of u32 (saving 3 bytes
per word)
* Update layout width/height to be u16 from int
* Update page element count to be u16 from u32
* Update text block element count to be u16 from u32
* Bumped section bin version to version 8

src/activities/reader/FileSelectionActivity.cpp

@@ -173,7 +173,7 @@ void FileSelectionActivity::render() const {
   renderer.clearScreen();
 
   const auto pageWidth = renderer.getScreenWidth();
-  renderer.drawCenteredText(UI_12_FONT_ID, 15, "Books", true, BOLD);
+  renderer.drawCenteredText(UI_12_FONT_ID, 15, "Books", true, EpdFontFamily::BOLD);
 
   // Help text
   const auto labels = mappedInput.mapLabels("« Home", "Open", "", "");