Add Byte String stuff, remove Services, cleanup and refactor interop stuff, disable path resolver for the moment

Penumbra.GameData/ByteString/ByteStringFunctions.Manipulation.cs

@@ -0,0 +1,45 @@
+using System.Runtime.InteropServices;
+
+namespace Penumbra.GameData.ByteString;
+
+public static unsafe partial class ByteStringFunctions
+{
+    // Replace all occurrences of from in a byte array of known length with to.
+    public static int Replace( byte* ptr, int length, byte from, byte to )
+    {
+        var end         = ptr + length;
+        var numReplaced = 0;
+        for( ; ptr < end; ++ptr )
+        {
+            if( *ptr == from )
+            {
+                *ptr = to;
+                ++numReplaced;
+            }
+        }
+
+        return numReplaced;
+    }
+
+    // Convert a byte array of given length to ASCII-lowercase.
+    public static void AsciiToLowerInPlace( byte* path, int length )
+    {
+        for( var i = 0; i < length; ++i )
+        {
+            path[ i ] = AsciiLowerCaseBytes[ path[ i ] ];
+        }
+    }
+
+    // Copy a byte array and convert the copy to ASCII-lowercase.
+    public static byte* AsciiToLower( byte* path, int length )
+    {
+        var ptr = ( byte* )Marshal.AllocHGlobal( length + 1 );
+        ptr[ length ] = 0;
+        for( var i = 0; i < length; ++i )
+        {
+            ptr[ i ] = AsciiLowerCaseBytes[ path[ i ] ];
+        }
+
+        return ptr;
+    }
+}