Update stm32f3 to 0.9

[Sh3Rm4n]

This PR updates to stm32f3 v0.9.

Also, register access methods where upgraded to use the variant based methods, introduced in the svd2rust version 16 (see the CHANGELOG).

I reduced the scope to change only the peripherals, where it worked seamless.

I've prepared PR's for the missing peripheral modules, but I did'nt include them, as stm32f3 does not provide the variant methods for all stm32f3 devices, because they are'nt documented yet.

[dfrankland]

I wasn't able to get serial or USB HID to work with this upgrade 😖

Simple things like blinking LEDs, input pins, semihosting, and using alloc all worked.

[Sh3Rm4n]

Okay. I'll have to investigate. Will check this tomorrow.

Thanks for testing it! :)

[Sh3Rm4n]

Okay, i could confirm, that USB is not working.

It seems like, that the clearing of the reset pin is important (sometimes?)

I remove the clear_bit part, because sometimes it says in the reference
manual, that writing 0 to the reset register "has no effect".

On other occasion it say's "does not reset the " as for USB.

stm32f3 does not expose a unreset variant method.

As the reset register are read-write registers and it worked before, i readded
the clear_bit part

It should work now again.

[dfrankland]

Looks good to me! I was able to successfully test everything.

[dfrankland]

I think we should be good to go on this one. @Sh3Rm4n feel free to merge 👍