Removed legacy code from wrist_coin.c.

Removed all of the old legacy code from wrist_coin.c. Also reenabled
the communication of volume data from the JavaScript to the Pebble.
Moved status information out of ExData.

Since ExData is used in several areas and the status is only relevance
to the main interface I moved status elsewhere.
Change application to use new ExData function.

I’m creating a series of functions to more easily interact with ExData
structs.
Continued work on useing ExData function.

Nothing else ot really say here other than the app doesn’t crash upon
closing now.
Switched ex_stat_list to be a char **.

I can’t think of any reason to use a struct for holding a status so
it’s been swithed to a char**.
Created new format functions and remove strdyncpy.

I moved the code for formatting digits into format.h/format.c. The
strdyncpy function has also been removed as specific string copying
functions have been created to replace it.
Working on the exchange detail screen.

Begun work on redoing the exchange detail screen.