add wip tileset and example tilemap

[vywn]

• Add sample tileset and terrain sets
• Add sample tilemap in the forest entrance scene - autotiling works ok but is janky
• Tweak project settings for 2d pixel scaling (mostly setting texture filter to Nearest)

ref #2

[vywn]

Didn't implement collision btw

[vywn]

player sprite (might regret the shading when i animate this lol) for some reason it looks blurry in the game but i give up on making it look good...