feat: add initial support for size_t

From looking at an event log which utilises size_t it can be seen to
output size_t in hex. This commit adds support for widths 4 & 8, by
applying them to the HexInt32 and HexInt64 variants.

Author: alexkornitzer

src/binxml/value_variant.rs

@@ -263,13 +263,11 @@ impl<'a> BinXmlValue<'a> {
             (BinXmlValueType::Real64Type, _) => BinXmlValue::Real64Type(try_read!(cursor, f64)?),
             (BinXmlValueType::BoolType, _) => BinXmlValue::BoolType(try_read!(cursor, bool)?),
             (BinXmlValueType::GuidType, _) => BinXmlValue::GuidType(try_read!(cursor, guid)?),
-            // TODO: find a sample with this token.
-            (BinXmlValueType::SizeTType, _) => {
-                return Err(DeserializationError::UnimplementedValueVariant {
-                    name: "SizeT".to_owned(),
-                    size,
-                    offset: cursor.position(),
-                })
+            (BinXmlValueType::SizeTType, Some(4)) => {
+                BinXmlValue::HexInt32Type(try_read!(cursor, hex32)?)
+            }
+            (BinXmlValueType::SizeTType, Some(8)) => {
+                BinXmlValue::HexInt64Type(try_read!(cursor, hex64)?)
             }
             (BinXmlValueType::FileTimeType, _) => {
                 BinXmlValue::FileTimeType(try_read!(cursor, filetime)?)