feature/day_and_night #34

The first full farming loop!!!!
That contains:

you can plant seeds!
if you water them (and only if) they grow the next day!
one plant lifecycle step (a jump from one stage to the next) is 3 (watered) days long
going to bed triggers a day count up (also cheat option: space key)
passing through the night maze reloads the bedroom again (and thus: the next day!)
fields distinguish between scene reload with day change (field gets dry again) and scene reload without day change (field remains wet)
We have saveable variable nodes now. They carry a variant payload and auto-save themselves to disk (if you set them up correctly, i.e. you give them a populated SaveID string Metadata).
fixed some issues with saving the inventory state
saving watering can fillstate now

please read commit messages for more information, I've tried to be descriptive and today was a long day.
It's all still very wobbly and needs some love, but we are finally getting somewhere <3

Nur ein paar Kleinigkeiten

				`[Signal] public delegate void LookDirectionEventHandler(Vector2 direction);`


				`public override void _Ready()`

         }
     }
     public void IncrementDaysGrowing()

feature/day_and_night #34

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