Support for protocol mangling is missing

[1NFR4R3D]

While trying to work with an IC, I noticed that the library does not currently support I2C protocol mangling.

I was wondering if support was planned, otherwise I could try my hand at it and submit a PR.

My thoughts were to check if one of the I2CMessageFlags covered by protocol mangling are set, and if so, to set the I2CFunctions flag.

Suggestions on how I can implement it will be greatly appreciated, as I am quite new to Rust in general!