cleanup more warnings and deprecated function use

src/datamatrix/encoder/default_placement.rs

@@ -224,6 +224,7 @@ impl DefaultPlacement {
         self.module(1, self.numcols as isize - 1, pos, 8);
     }
 
+    #[allow(dead_code)]
     fn toBitFieldStringArray(&self) -> Vec<String> {
         let bits = self.getBits();
         let numrows = self.getNumrows();

src/datamatrix/encoder/encoder_context.rs

@@ -20,7 +20,6 @@ use crate::{Dimension, Exceptions};
 
 use super::{SymbolInfo, SymbolInfoLookup, SymbolShapeHint};
 use encoding::{self, EncodingRef};
-use unicode_segmentation::UnicodeSegmentation;
 
 const ISO_8859_1_ENCODER: EncodingRef = encoding::all::ISO_8859_1;
 

src/datamatrix/encoder/high_level_encoder.rs

@@ -24,6 +24,7 @@ use super::{
     ASCIIEncoder, Base256Encoder, C40Encoder, EdifactEncoder, Encoder, EncoderContext,
     SymbolInfoLookup, SymbolShapeHint, TextEncoder, X12Encoder,
 };
+#[allow(dead_code)]
 const DEFAULT_ENCODING: EncodingRef = encoding::all::ISO_8859_1;
 
 /**

src/datamatrix/encoder/symbol_info.rs

@@ -354,13 +354,12 @@ impl<'a> SymbolInfoLookup<'a> {
 }
 
 mod tests {
-    use crate::{
-        datamatrix::encoder::{SymbolInfo, SymbolShapeHint},
-        Dimension,
-    };
+
+    use crate::{datamatrix::encoder::SymbolShapeHint, Dimension};
 
     use super::SymbolInfoLookup;
 
+    #[allow(dead_code)]
     const LOOKUP: SymbolInfoLookup = SymbolInfoLookup::new();
 
     /**