ESP32 RMT High-priority Interrupt driver

[willmmiles]

Temporarily switch to a NeoPixelBus fork with a custom high-priority interrupt based driver for using the RMT hardware on ESP32 platforms. This driver is currently draft PR'd upstream at Makuna/NeoPixelBus/pull/892. Fixes #4389 and related issues.

Currently I've tested ESP32 (IDF v3 and v4), ESP32-S2, and ESP32-S3; it works well for me. Further testing would be very helpful!

ESP32-C3 support is still pending as it will require a different IRQ shim layer.

I'm opening this draft to provide a link to builds with the current WIP version.

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[blazoncek]

AFAIK free() can "release" a nullptr. So if() is superfluous. Right?

[willmmiles]

I'd always thought it was UB, but you're right, it's defined as a no-op by the C standard. (Whether any given allocator is standards-compliant is another story...)

In this case the objective was to shut the compiler up about "deceptive if statements" -- building the IDF brings in '-Wall -Werror'. Actually I thought I'd left this commit out of the PR branch as it's mostly a testing/debugging thing. I'll re-arrange and resubmit.