CodeQL: scope analysis to src/ so libdeps stop drowning the alerts #67

Job	Run time
pio check (cppcheck on src/) (cores3)	43s
pio check (cppcheck on src/) (core2)	48s
pio run -e cores3	50s
pio run -e visu	47s
pio test -e native (pure-logic units)	30s
pio run -e core2	46s
pio run -e pip	39s
	5m 3s

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