Support for playing buffers in audiocontextmanager (#3741)
Support for playing buffers in audiocontextmanager (#3741)

* support for playing buffer

* handle error in plyaing sounds

Microsoft/pxt,Microsoft/pxt,Microsoft/pxt,switchinnovations/pxt,switchinnovations/pxt,switchinnovations/pxt,switch-education/pxt,playi/pxt,switchinnovations/pxt,Microsoft/pxt,switch-education/pxt,playi/pxt,playi/pxt,switch-education/pxt,playi/pxt,Microsoft/pxt,switch-education/pxt,switch-education/pxt