Add some bit utils and initial l77 encoder.

src/core/CMakeLists.txt

@@ -14,6 +14,7 @@ list(APPEND core_HEADERS
 )   
 
 list(APPEND core_LIB_INCLUDES 
+    ByteUtils.cpp
     Event.cpp
     Dictionary.cpp
     Color.cpp
@@ -28,6 +29,7 @@ list(APPEND core_LIB_INCLUDES
     RandomUtils.cpp
     StringUtils.cpp
     streams/BinaryStream.cpp
+    streams/BitStream.cpp
     http/HttpResponse.cpp
     http/HttpHeader.cpp
     http/HttpRequest.cpp