"not enough rainbows, 1 star uninstall"

(Rainbow Mode - Easeter Egg)

No longer will we get bad reviews on CWM recovery for its lack
of rainbows! Originally design by gweedo767, this patch brings
back the wrap count mechanism from v2.0.2.4 to toggle Rainbow
Mode for the user. In the original design, every character has
a different color, but that method requires modifying graphics.c
which will cause breakage in devices with custom graphics.c.
This Rainbow Mode has a different color for each line, instead.
The wrap_count has been set to 5 instead of the previous 3 so
the toggle won't occur as often, if on accident.

Change-Id: Ie9f6f1b6ed94ee69d4d8d9fe27f9a5417cc3f212