gateware.iostream.IOClocker: Fix phase and state keeps flipping. When i_stream is idle, there is currently nothing that prevents the state machine from changing state between Falling/Rising, toggling phase, and restarting the timer. This results in lost power, and sometimes shortened clock pulses after an idle period.

applet.memory.onfi: add an option to toggle internal pull-up for R/B#

manual: add libusb dependency for macOS

software: update `pdm.min.lock`.

software: update `pdm.min.lock`.

manual: describe pin inversion feature Documenting the pin inversion feature that was implemented in commit 4f89908ad953452768b4a6f1d1ac8b67b2634852

test_qspi: make more robust by immediately detecting deasserted CS line

test_qspi: added ddr controller test, and various divisors

tests: implement glitchless SimulatableDDRBuffer Thanks '2 Wanda' for the idea!

gateware.qspi.QSPIController: fix multi-chip operation