Qoob updater(s)

[9ary]

Similar to #42, we need an open source updater for Qoob. This will have to be reversed and/or copied from Swiss.

This is especially important for Qoob SX, in order to lift the 62800 byte limitation. Not a lot of space to be gained there but still significant.

Questions for Qoob SX:

• Can the recovery slot be rewritten?
• Can we expand usable space for the real payload?
• How different is it from Qoob Pro?

[9ary]

Findings from reversing the flasher:

Questions for Qoob SX:

* Can the recovery slot be rewritten?

Most likely, unless the FPGA actively gets in the way, the flash chip doesn't seem to have protectable sectors.

* Can we expand usable space for the real payload?

The flash chip on the SX uses 4KiB sectors, while the Pro uses 64KiB sectors (with a handful of smaller ones at the start of flash). It should be trivial to repartition the SX as long as a small enough preloader can be written.

* How different is it from Qoob Pro?

Basically the same other than the flash chip.