BinaryWriter: add a way to access the temp array.

That way, I'll be able to easily compute the CRC32 of it.

src/UESaveFile/BinaryWriter.cpp

@@ -46,6 +46,10 @@ auto BinaryWriter::position() -> Long {
     return _ftelli64(_file);
 }
 
+auto BinaryWriter::array() const -> Containers::ArrayView<const char> {
+    return _data;
+}
+
 auto BinaryWriter::arrayPosition() const -> UnsignedLong {
     return _index;
 }

src/UESaveFile/BinaryWriter.h

@@ -45,6 +45,7 @@ class BinaryWriter {
 
         auto position() -> Long;
 
+        auto array() const -> Containers::ArrayView<const char>;
         auto arrayPosition() const -> UnsignedLong;
         auto flushToFile() -> bool;