FishLight: Update button time and bright setting

Updated the buttons time setting capability to be more robust and to
actually be able to abandon time changes with the Y/N 'N' option.  Also
added a custom character for the '\' since my LCD controller doesn't
seem to have it.  This is actually pretty easy to do but is really ugly
to read...  Also added the capability to actually get into the buttons
LED brightness changing functions, but they aren't fully functional yet.
But they are doing things like printing menu functions.  Just can't
actually set the brightness yet.
FishLight: Add a topbar character and LED structs

Added a new LCD character to make a top bar (like an underscore but on
top) to make the peaks menu look more appropriate and fixed the
corresponding functions to initialize that new character and print it
out.

Also added structures for the LEDs.  These structures contain all the
variables needed to manipulate the LEDs in any function.  They are not
connected to anything yet but this will help with the buttons brightness
setting and making the brightness calculator more generic.
FishLight: Add Excel file to chart LED brightness

Adding a file to chart the brightness of the LEDs throughout the day.
This is an Excel spreadsheet that contains data from the brightness
calculations for each LED.  It only prints out every 10th data point
because Excel can only handle 255 points.  But that is good enough to
get me a good approximation of the shape of the LED curves.
FishLight: Got LED structures working with scheds

Got the LED variable structures working with the LED schedule function.
The brightness seems to hold to the same pattern as it did before.
HOWEVER, the Blue LED is not working and the Warm White LED does not
have an 'off brightness' besides just off.  Maybe make a 'trough' or
'on_start_bright' and 'off_time_bright' variables?  Main problem is
getting the Blue LED to work since it wraps from ~1260 - 0 - ~240 (mins
since midnight which is about 9pm - 4am).
FishLight: Added new struct and changed menu funcs

Added a new structure LED_STRINGS which holds all the led structures.
Updated all of the functions referencing an LED structure to get the
right one from this new structure.  Also updated the menu functions to
be a bit more portable.  Made the peaks LCD printout their own function
to be usable multiple places.
FishLight: Make the brightness dump more robust

Make the brightness dumping print statements a bit more robust.  They
will now dump brightness data for all LEDs into a nicer CSV format for
easy import into an XLS spreadsheet to graph the brightness curves.