Add paragraph alignment setting (justify/left/center/right) (#191)

## Summary

* **What is the goal of this PR?** 

Add a new user setting for paragraph alignment, instead of hard-coding
full justification.

* **What changes are included?**

One new line in the settings screen, with 4 options
(justify/left/center/right). Default is justified since that's what it
was already. I personally only wanted to disable justification and use
"left", but I included the other options for completeness since they
were already supported.

## Additional Context

Tested on my X4 and looks as expected for each alignment.

Co-authored-by: Maeve Andrews <maeve@git.mail.maeveandrews.com>

src/CrossPointSettings.h

@@ -43,6 +43,7 @@ class CrossPointSettings {
   // Font size options
   enum FONT_SIZE { SMALL = 0, MEDIUM = 1, LARGE = 2, EXTRA_LARGE = 3 };
   enum LINE_COMPRESSION { TIGHT = 0, NORMAL = 1, WIDE = 2 };
+  enum PARAGRAPH_ALIGNMENT { JUSTIFIED = 0, LEFT_ALIGN = 1, CENTER_ALIGN = 2, RIGHT_ALIGN = 3 };
 
   // Sleep screen settings
   uint8_t sleepScreen = DARK;
@@ -62,6 +63,7 @@ class CrossPointSettings {
   uint8_t fontFamily = BOOKERLY;
   uint8_t fontSize = MEDIUM;
   uint8_t lineSpacing = NORMAL;
+  uint8_t paragraphAlignment = JUSTIFIED;
 
   ~CrossPointSettings() = default;