This commit:
1. Renames Fill Sensor and Door Switch
2. Opens door when in Platform Lower loop
3. Prevents bottle from being pressurized or filled if door is open
4. Opens door when bottle is depressurized
1. Prevents door solenoid from clicking if door already open
2. Requires  simultaneous push of B2 then B1 to purge
Merge branch 'feature/Safety_Door' into develop