make density-specific recovery assets

Provide different recovery UI resources for different display
densities.  Right now only the text images and the progress bars are
rescaled; the main icon will get scaled when it's updated for QP.

Lightly quantum-ify the rest of the recovery interface.  (Light
background, progress bars, etc.)

Change-Id: Ia639c4ce8534b01bc843524efbc4b040c1cf38b3
diff --git a/screen_ui.h b/screen_ui.h
index 92e4795..2e01acd 100644
--- a/screen_ui.h
+++ b/screen_ui.h
@@ -87,6 +87,9 @@
     static const int kMaxCols = 96;
     static const int kMaxRows = 96;
 
+    static const int kTextXOffset = 8;
+    static const int kTextYOffset = 4;
+
     // Log text overlay, displayed when a magic key is pressed
     char text[kMaxRows][kMaxCols];
     int text_cols, text_rows;