142th update: Theme Sorter + Single Files 1/7

I'm back from the Christmas break and I'm ready to make
tons of new sprites!

As the majority of you have surely noticed, I spent the break time
to finish and publish a new asset pack: Modern UI!

update v16.5

A few updates to make everything tidier, since the asset pack is getting massive

- Remade the Theme Sorter and divided the current stuff into 13 themes
- The next step is to make all the single files (meaning 1 sprite x file) from each theme

See you and happy game-making! :)