program change midi command

[felixroos]

As discussed in the discord, it would be handy to have a program midi command to simplify switching programs / banks.
The process of switching a program involves:

• sending cc 0 for msb
• sending cc 32 for lsb (optional)
• sending program change midi command

more context here

midi.mjs could implement a command named program that would work like this:

midicmd("program:<msb>:<lsb>")

so midicmd("program:0:0") would send msb 0 lsb 0 and then a program change. the lsb part could also be optional and default to 0.
i guess that would work then with any vst / hardware that supports program change

Thanks Jerome for kicking this off