Make Sprite serde(transparent), simplifying loader.
Make Sprite serde(transparent), simplifying loader.

TIL serde(transparent)
 - https://serde.rs/container-attrs.html#transparent
 - https://stackoverflow.com/questions/53280539/custom-deserialization-of-an-array-or-array-of-values-using-serde

joetsoi/moonstone,joetsoi/moonstone