Add setting to enable status bar display options (#111)

Add setting toggle that allows status bar display options in EpubReader.

Supported options would be as follows: 

- FULL: display as is today
- PROGRESS: display progress bar only
- BATTERY: display battery only
- NONE: hide status bar

---------

Co-authored-by: Dave Allie <dave@daveallie.com>

src/CrossPointSettings.h

@@ -18,8 +18,13 @@ class CrossPointSettings {
   // Should match with SettingsActivity text
   enum SLEEP_SCREEN_MODE { DARK = 0, LIGHT = 1, CUSTOM = 2, COVER = 3 };
 
+  // Status bar display type enum
+  enum STATUS_BAR_MODE { NONE = 0, NO_PROGRESS = 1, FULL = 2 };
+
   // Sleep screen settings
   uint8_t sleepScreen = DARK;
+  // Status bar settings
+  uint8_t statusBar = FULL;
   // Text rendering settings
   uint8_t extraParagraphSpacing = 1;
   // Duration of the power button press