Build with 8a15cec6bf99f59065879a14895fb8af8a8a53e7 libopnecm3

Lorenz's comments from the other PR still apply:

* License change from GPL to LPGL: Is this vetted? Unless it is, it can't be done.: Have reached out to esden to determine how we will licence.

* Changing the PID of the bootloader: I don't want to mix up PID changes with functionality changes: It is set back to 0x0011

Additional comments from Kevins PR:

* Have we tested each and every previous board to still bootload correctly: I only have a Mav Station and V2 PX4FMU and PX4IO all worked.

* How difficult would it be to also add support for USB+serial for the F4?:I will look into this