[#1878] Fix leak of ByteBuf when masked payload is used
[#1879] Correctly validate close frame
[#1880] Use ByteBufAllocator when read bytes into new chunks
[#1876] Make use of proper state machine in WebSocket08FrameDecoder for performance reasons
use enum for state in EmbeddedChannel
use enum for state in LocalChannel
Fix checkstyle
[#1885] Correctly close leak detected also on non started HashedWheelTimer
disable debugging output during test
[#1881] Use correct field name in NullPointerException