updates and refactorization

Added booleans to control flow of program and check conditions before
running preconditioning or bioimpedance.

Refactored error code for checkAndDelegate function to be more
streamlined and manageable.

Updated structures/defines.

Added in old code for startPreconditioning (still have to update code)
and placeholders for startBioimpedance and startFullCycle.

Brought in helper functions from old code, still have to update.

Increased default baud rate for serial communication.