Port EntitySet's free list from shooter-rust-wasm project

Move texture3 to a custom payload in BackgroundLocations

Merge pull request #14 from msakuta/fraction_ores

Make ore distribution overlay togglable

Show distribution of ores in tint

Factor out make_shader.rs to redulce assets.rs code

Use relative ratio of ores to smelt

Show ores in tiles

Make the ore distribution generated from Perlin noise

Transfer ore amounts from tiles to excavator

Fix unittest and add Cargo.lock to avoid errors in Rust 1.80+

Show ores inventory and smelting prgress separately

Send ores to smelting task automatically

Pull ores from storage to furnace

Move ores in fractional amount from excavator to storages