Nitpicks

[newAM]

• Replace wall-of-text # Safety sections with enumerated check-lists of requirements.
• Lots of duplicated code across testsuites (fixed in testsuite: deduplicate code #82)
• Provide a from_millis, from_nanos, from_secs ect. with subghz::Timeout
• Normalize meta-access of peripherals for all peripherals (maybe trait these to enforce uniformity?)
  • pub unsafe fn steal() -> Self
  • fn mask_irq()
  • pub unsafe fn unmask_irq()
  • pub unsafe fn pulse_reset(rcc: &mut pac::RCC)
  • pub fn enable_clock(rcc: &mut pac::RCC)
  • pub unsafe fn disable_clock(rcc: &mut pac::RCC)
  • Normalize what new does with regards to clocks, resets, enables, and interrupts