Re-implement stm32f4 platform #111
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This improves performance by eliminating a dsb instruction
This drops the libopencm3 dependency, and adds libusb_stm32 and the cmsis device headers for the stm32f4. Functionality mirrors the gd32f4 port. Support for the stm32f4[01][57] is dropped due to the DMA errata, and flashing relies on dual bank support.
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Using the GD32 (merged) and stm32h7 ports (in branch) as a reference, re-implement the stm32f4 platform. Drop the libopencm3 dependency, while adding a dependency on the ST-provided cmsis device library, and libusb_stm32 for usb support.
This change commits to the resource usage pattern from the GD32 port, which drops support for the stm32f40x/41x, which has been a long time coming due to the DMA errata. The dual bank flash allows flash updates without the engine being stopped.