Handle if / else statements

example:

```ini
#if CELSIUS
    egoTemp = scalar, U08,        4,   "C",        1.0, -40,  -40,  102.0,      0
#else
    egoTemp = scalar, U08,        4,   "F",       1.8,   -22.23,  -40,  215.0,      0
#endif
```