(Breaking) Add more res/freq configurations to PWM#196

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IamfromSpace wants to merge 4 commits intostm32-rs:masterfrom

IamfromSpace:feature/add-more-flexible-pwm-clock-config

Commits on Jan 16, 2021

(Breaking) Add the ability to configure PWM resolution/frequency by setting the exact register values.
IamfromSpace
committed

Commits on Jan 25, 2021

Add a PrioritizeResolution strategy and show its error bound.
IamfromSpace
committed

Commits on Jan 28, 2021

Correct small error.
IamfromSpace
committed

Commits on Feb 1, 2021

Add a PrioritizeFreq strategy for trying to cheaply set the frequency as close as possible to the target.
IamfromSpace
committed