Implements an advanced pulsometer that can be calibrated by the user. Also features a streamlined and responsive user interface, new documentation and generally improved code. Tested-by: Matheus Afonso Martins Moreira <matheus.a.m.moreira@gmail.com> Tested-on-hardware-by: Matheus Afonso Martins Moreira <matheus.a.m.moreira@gmail.com> Signed-off-by: Matheus Afonso Martins Moreira <matheus.a.m.moreira@gmail.com> GitHub-Pull-Request: https://github.com/joeycastillo/Sensor-Watch/pull/371