Misc fixes

[vintagepc]

Description

Minor features and fixes - a ? hotkey and a null pointer dereference.

Behaviour/ Breaking changes

• Prints key reference to console if user presses ? key
• Sim no longer crashes if holding C and trhe card unmounts while mid-read.

Linked issues:

• Fixes [BUG] Crash on SD card handling when rapid-firing 'c' #323
• Fixes [FEATURE] Handle "?" to display keyboard shortcuts while running #324

[codecov]

Codecov Report

Merging #325 (b282546) into master (03b0780) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #325   +/-   ##
=======================================
  Coverage   88.84%   88.84%           
=======================================
  Files         148      148           
  Lines        6707     6708    +1     
=======================================
+ Hits         5959     5960    +1     
  Misses        748      748           

Impacted Files	Coverage Δ
parts/KeyController.cpp	100.00% <100.00%> (ø)
parts/components/SDCard.cpp	93.55% <100.00%> (-0.04%)	⬇️

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