Feature request: Add rMQR Code encoder #80
Description
rMQR Code (Rectangular Micro QR Code) is a type of QR Code invented in 2022. It addresses the need to print in narrow spaces where conventional QR Code could not be printed, and to store more information than possible with Micro QR Code. It's standardized as ISO/IEC 23941, just like QR Code and Micro QR Code are standardized as ISO/IEC 18004.
I think it would be useful to have a rMQR Code encoder in this crate. This is because rMQR Code has the above advantages and and is standardized.
The qrqrpar crate seems to implement a rMQR Code encoder, so this may be helpful when implementing it in this crate.
When the encoder is implemented, I'd like to use it in the qrtool crate.
