Add Saving and Loading

[Riximus]

Work to do:

• [x] Save
• [x] Load

Method: Binary Serialization

Resources: Binary saving Typical Save getting the whole tree GDQuest approach Advanced Save System with Slots and Date

[Riximus]

Save and Loading work, kinda. It saves and loads but currently not suitable for multiple objects. Trying to fix it.

[Riximus]

Check out all the "store_*" methods to save:

FileAccess Docs