cec_linux 0.2.1

A pure rust library to use the HDMI-CEC linux API
Documentation 
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A pure rust library to use the [CEC linux API](https://www.kernel.org/doc/html/v6.18/userspace-api/media/cec/cec-api.html) (as found on Raspberry Pis with bookworm)

# Background

While libcec and thus [cec-rs](https://crates.io/crates/cec-rs) also works with the linux driver,
I noticed after upgrading from bullseye to bookworm that some messages are only visible to me in monitor mode.
So they are missing in cec-rs as well as the old firmware driver is gone in bookworm.