Prep for Testing 9

Created pow_10 function, had to know it this because pow10 is the name of an inbuilt function in math.h
- This function made strictly to calculate integer powers of 10
- Doesn't take up as much space at the built in pow10 function ("I'm assuming")
Also ensured that ftoa 'rounds' the 'afterpoint' digit instead of just cutting off the numbers after 'afterpoint'
Major Update - Improved NHD_LCD screen API:
- files (source, header and config) no longer dependent on main.h
- created a handle for the display,
- all functions contain the handle in the parameter list
- user initializes the handle in the beginning of the main function
Seems to be evidence of issue true linearity of ADC differing from actual linearity:
- Vo set to 2.0V
  - Output Voltage - DC Power Supply Value : VVC Value
    - 4.00V : 4.0V
    - 5.00V : 5.1V
    - 6.00V : 6.1V
    - 7.00V : 7.1V
    - 8.00V : 8.1V
    - 9.00V : 9.1V
    - 10.00V : 10.2V (infrequently goes down to 10.1V)
    - 11.00V : 11.2V
    - 12.00V : 12.2V
    - 13.00V : 13.2V
    - 14.00V : 14.2V
    - 15.00V : 15.3V (infrequently goes down to 15.2V)
    - 16.00V : 16.3V
    - 17.00V : 17.0V (ADC clips at 17.0V)

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