Clean Up Code & Add Battery Levels

- Removed unused functions to reduce size and complexity
- Added reading of wixel battery on P0_5
- Changed the formatting of the data output to match the expected values
in the DexDrip Android app (App was reading battery from the second
field [1] rather than third and raw data from [0].  Wixel was sending
data as RAW FILTERED BATT, with the filtered data never being used by
the android app.  Since three fields are expected by the Android app,
this puts the expected fields in their respective positions and allows
for the wixel battery voltage to be sent in the third field to be used
once I develop the integration in the app.
- Moved variables to XDATA if possible, reducing PSEG to 155
Two resistors (1.2k and 2.2k) and a piece of wire to create a voltage divider.  You don't want to hook the battery straight up because the voltage tolerance of the wixel's chip is only 3.6v and the LiPo battery can get up to 4.2v according to the adafruit site.  I'll upload a diagram showing how to do it a bit later, but it's fairly simple.  The battery shuts off at 3v, according to the specs, so I need to find out the reading at 3v vs a full battery (which is what I was working on when I killed it last night).