fix static code analysis warnings

[HacksBugsAndRockAndRoll]

still looking for the culprit behind #83

some findings from cppcheck fixed

• lots of initialization stuff
• overrides
• const for buffer parameters

actual logic changes

• in lib/Hoymiles/src/parser/AlarmLogParser.cpp
• all the places printing the inverter serial as hex string

[stefan123t]

@HacksBugsAndRockAndRoll how did you use cppcheck, may we add this easily to the github actions ?
Some of the findings may be useful initializations, easier syntax, etc.