Replace C++ bitfields with our own BitFields

src/utils.h

Index: src/utils.h
diff --git a/src/utils.h b/src/utils.h
index dcefa44070308d1445ef0734f06cdc1cf2c1d8b2..d5685c98207d3a2211919f4a0dbbafef2b980304 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -230,6 +230,14 @@ class BitFieldBase {
 };
 
 
+template <class T, int shift, int size>
+class BitField8 : public BitFieldBase<T, shift, size, uint8_t> {};
+
+
+template <class T, int shift, int size>
+class BitField16 : public BitFieldBase<T, shift, size, uint16_t> {};
+
+
 template<class T, int shift, int size>
 class BitField : public BitFieldBase<T, shift, size, uint32_t> { };