0.1.8-save ongoing session progress!

In this update, I have introduced automatic saving of the current holding session is saved along with the status of the digestive system (how much water you have drunk and how much has reached the bladder). 

This makes using this app on mobile more convenient, as the status of your current session will not be reset after refreshing the page.

Note: The state of the holding session and digestive system is still reset after 1 hour of inactivity.