Expand unit tests

[vintagepc]

Add test coverage for the various peripherals. WIP.

Closes #129

[codecov-commenter]

Codecov Report

Patch coverage: 83.73% and project coverage change: +16.58% 🎉

Comparison is base (5cc5c0e) 18.31% compared to head (11e8442) 34.89%.

Additional details and impacted files

@@             Coverage Diff              @@
##           MINI404     #130       +/-   ##
============================================
+ Coverage    18.31%   34.89%   +16.58%     
============================================
  Files          129      123        -6     
  Lines        13286    12023     -1263     
  Branches      2647     2195      -452     
============================================
+ Hits          2433     4196     +1763     
+ Misses       10753     7570     -3183     
- Partials       100      257      +157     

Files Changed	Coverage Δ
hw/arm/prusa/stm32f030/stm32f03x_rcc.c	90.04% <ø> (+24.17%)	⬆️
hw/arm/prusa/stm32f407/stm32f2xx_rcc.h	100.00% <ø> (ø)
hw/arm/prusa/stm32f407/stm32f4xx_rng.h	100.00% <ø> (ø)
hw/arm/prusa/stm32_common/stm32_common.c	65.29% <50.00%> (+14.70%)	⬆️
hw/arm/prusa/stm32_common/stm32_rcc.c	77.33% <50.00%> (+12.46%)	⬆️
hw/arm/prusa/stm32_common/stm32_crc.c	91.02% <60.00%> (+51.26%)	⬆️
hw/arm/prusa/stm32_common/stm32_otp.c	78.57% <60.00%> (+29.44%)	⬆️
hw/arm/prusa/stm32_common/stm32_syscfg.c	94.11% <60.00%> (+44.11%)	⬆️
hw/arm/prusa/stm32g070/stm32g070_flashint.c	91.66% <60.00%> (+62.80%)	⬆️
hw/arm/prusa/stm32_common/stm32_f2xx_f4xx_dma.c	90.25% <72.97%> (+77.19%)	⬆️
... and 14 more

... and 18 files with indirect coverage changes

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