Enable misra-c2012-8.4

[mpetkovic96]

for #1794 Where it was possible, external and static linking was used. Otherwise, suppression was utilized. Additionally, global variable scopes were reduced to function scope.

[mpetkovic96]

@adeebshihadeh Could you check if this approach is correct?

[maxime-desroches]

Closing because 8.4 is solved now