Reorganized so i2c code is in register reading and writing functions. Rewrote power functions for reset and power options. Added mpu6050 scale set functions and local scaling functions. Tested connecting, reading data and changing scale, all working.

The new files wrap the mpu6050_i2c.c functions in a cpp class. New read function includes scale. Also split separate accel, gyro, and temp scale functions. NOT tested.

Tested cpp code works to read mpu. main() renamed test() so I can call it in other code.

the code that's been running with simplewalker. Also add self-test even though idk what it does.

add scale_test executable demonstrating C++lib and scaling, create enum MPU6050::Scale, C++ set bus_addr, remove #include stdlib.h from headers