add MCP4532 rheostat functionality to potcontrol test program
Revert "add MCP4532 rheostat functionality to potcontrol test program"

This reverts commit 7e23a16f2eb028d547b00421b56c009d98290030.
MCP4532 test setup (still needs debug- possible hardware issue)
add fadebalance module for fade/balance control.
change display module to use real sensor data.
add main.c for final application.