Simplify constructors using expression-bodied members

Replaced multi-line constructors with single-line expression-bodied members across several converter classes for improved readability and conciseness. Also adjusted method accessibility in NarratorCasingConverter to make `NarratorToUppercase` private.

Author: ivandrofly

source/HI2UC/Converters/NarratorCasingConverter.cs

@@ -12,10 +12,7 @@ public class NarratorCasingConverter : ICasingConverter
 
     public IConverterStrategy ConverterStrategy { get; }
 
-    public NarratorCasingConverter(IConverterStrategy converterStrategy)
-    {
-        ConverterStrategy = converterStrategy;
-    }
+    public NarratorCasingConverter(IConverterStrategy converterStrategy) => ConverterStrategy = converterStrategy;
 
     public void Convert(IList<Paragraph> paragraphs, ConverterContext converterContext)
     {
@@ -30,7 +27,7 @@ public void Convert(IList<Paragraph> paragraphs, ConverterContext converterConte
         }
     }
 
-    public string NarratorToUppercase(string text)
+    private string NarratorToUppercase(string text)
     {
         var noTagText = HtmlUtils.RemoveTags(text, true).TrimEnd().TrimEnd('"');
 

source/HI2UC/Converters/Strategies/TitleWordsConverter.cs

@@ -9,13 +9,10 @@ public class TitleWordsConverter : IConverterStrategy
     private readonly ChunkReader _chunkReader;
     public string Name => "Title case (word)";
     public string Example => "foobar foobar => Foobar Foobar";
-        
-    private readonly char[] _wordSplitChars = {' ' };
 
-    public TitleWordsConverter(ChunkReader chunkReader)
-    {
-        _chunkReader = chunkReader;
-    }
+    private readonly char[] _wordSplitChars = { ' ' };
+
+    public TitleWordsConverter(ChunkReader chunkReader) => _chunkReader = chunkReader;
 
     public string Execute(string input)
     {

source/HI2UC/Converters/Strategies/UppercaseConverter.cs

@@ -12,10 +12,7 @@ public class UppercaseConverter : IConverterStrategy
 
     public override string ToString() => Name;
 
-    public UppercaseConverter(ChunkReader chunkReader)
-    {
-        _chunkReader = chunkReader;
-    }
+    public UppercaseConverter(ChunkReader chunkReader) => _chunkReader = chunkReader;
 
     public string Execute(string input)
     {