v0.2 - add a lot of improvements

Hi everybody!   It took more than expected to be able to work in this, but here it goes!  After the game jam submission with Susie, I need a date! Pandemic Edition!, I really learnt a lot about game dev. 

Then I came back to this game and realized that I had  a lot of refactoring waiting for me haha. So, this update (v. 02) covers:

• Big refactoring of the logic of the game. A lot of the functionalities are now decoupled so that we can access those services from almost anywhere but there are no dependencies between them at the same time.
• New portraits for the characters are there. They might not be the final ones, but they are  okay to go.
• Following some Dreamed Away's pixel art style, I wanted to try to do 2.5D in interiors. You can see this in the house of Eytran. I still need to add more props there and I might do the house a bit bigger tbh.
• YSorting and Z-index is improved. Lindisfarne Town is already using the  tileset    layer workflow recommended by Godot.
• Much much more...