Using a radio program involving signal strength in Alpha crashes sim/fails on micro:bit

[jaustin]

Describe the bug

When moving a program that uses the radio 'gear' to add signal strength into the program and then upgrading it to v1/alpha the sim crashes on first use of radio with error:

Program Error: pxsim.radio.receivedBuffer is not a function

To Reproduce
Steps to reproduce the behavior:

1. Open this program in v0 https://makecode.microbit.org/_5eTATL2Apfhr
2. verify that the simulator behaves as expected (press button A once to bring in the second micro:bit, then A again to send a message over radio)
3. Download your program to two micro:bits and verify that when pressing button A the first micro:bit displays 'x' and then a signal strength value
4. Move to the alpha editor, import/open the same program
5. Use the simulator by pressing button A twice.
6. The second time you press button A the sim crashes with
   Program Error: pxsim.radio.receivedBuffer is not a function
7. Download the program to two micro:bits
8. When you press A on a real micro:bit, the second micro:bit only displays '0'

Expected behavior
The simulator and micro:bit behaves as they did in v0

Screenshots

Desktop (please complete the following information):
Windows 10 Chrome 66

Additional context
This also fails when loading a hex file from v0 to v1 and the user is not warned about any possible disruption.

If you want I can also file separate issues for things like the fact the new block can't be selected in alpha, but I though probably this would be enough for now?

[jaustin]

FWIW, this works fine if creating in alpha

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