Possible collisions between lua reading a channel by name and API creating a channel by name

[brentpicasso]

With lua reading a channel by name and a different task creating a new channel (e.g. via API and timing/scoring) - a collision may occur and firmware crash if the list of channels changes (via API) when lua is attempting to get a channel by name.

We probably need to add a mutex to protect reading and creating virtual channels.

[brentpicasso]

It seems that a mutex (lock) could be created in sampleRecord.c, protecting access to init_sample_buffer or (higher up the call stack) and get_channel_value_by_name. This will prevent issues of the sample record being changed while it is being scanned for the current channel value.