Feat/attendants object CRUD

[Rizaaal]

This needs attention. As you may have noticed, the functions are not tied to the attendance object. I made it this way for 2 reasons:

1. localStorage does not save object methods because they get stringified (JSON safe types)
2. even if i wanted to, i could't figure it out how to add the method in a way that it finds its attendances list. This is becaus arrow functions don't have a this value, and even if i used a normal function i had to create the attendance using the keyword new, which is not how our program works.

So i had to create orrible functions such as getAttendance, where you have to put a register id to get a property that gets a property to get another property. yay!

So if you have a better way to do this, just feel free to give your input on this