tileset 0.1.3

Tailset definition, and supports importing multiple formats
Documentation 
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use super::*;
use itertools::Itertools;
use serde::{ser::SerializeStruct, Serializer};

impl Serialize for FileSystemTiles {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let items = self
            .atlas
            .iter()
            .sorted_unstable_by(|a, b| a.key().cmp(b.key()))
            .map(|m| (m.key().clone(), m.value().clone()))
            .collect::<Vec<_>>();
        let mut state = serializer.serialize_struct("FileSystemTiles", 3)?;
        state.serialize_field("target_size", &(self.target_w, self.target_h))?;
        state.serialize_field("atlas", &items)?;
        state.end()
    }
}