Challenge level update

This game is cancelled. but I want to do a few more updates to polish some things up and finish off the things I started. (Mostly cause of squeeg)

Each world now has a challenge level (Modern Day already had one previously) it is difficult but beating it unlocks plants that you would get If I finished that world.

Unfinished worlds are now hidden, so you can't softlock yourself (Will possibly be added back later).

Vira-weed got a nerf.

Added progress bar to tell how far you are into a level.

Far future next update :)