py core:
- support more ops for bytes/bytarray
- support __hash__ for user-defined types
- support for float/double arrays in array module
- shorter error messages for TERSE message option
- add seek via ioctl to stream protocol
extmod:
- add uhashlib with sha256
unix port:
- heapsize can take w specifier for word adjustment
stmhal port:
- CAN init now takes sjw, bs1, bs2 args
- add CAN filter management
- fix HAL error raising bug
esp8266 port:
- new port to ESP8266 wifi chip
docs:
- minor additions