Add import support for Qlie tiled PNG image (.png)

src/types.rs

@@ -602,6 +602,10 @@ pub struct ExtraConfig {
     #[cfg(feature = "qlie-arc")]
     /// Whether to compress files in Qlie pack archive.
     pub qlie_pack_compress_files: bool,
+    #[cfg(feature = "qlie-img")]
+    /// Whether to use PNG file directly for Qlie DPNG images when importing.
+    /// Enable this will disable reencoding PNG files. Useful when the PNG files are already optimized by other tools.
+    pub qlie_dpng_use_raw_png: bool,
 }
 
 #[derive(Clone, Copy, Debug, ValueEnum, PartialEq, Eq, PartialOrd, Ord)]