Pipeline improvements (#964)

* Fix bug with toll-gate validation against master
* Change cppcheck to not attempt to validate headers directly and
  to run on the entire codebase in the pipeline.
* Support running Arduino test and examples build in parallel

.mystools/cppcheck/run.sh

@@ -7,11 +7,15 @@
 # --cached or <no arg> for changed
 if [[ $# = 0 ]]; then
 	for file in $(modifiedSourceFiles); do
-		runBundle $file
+		if [[ $file != *.h ]]; then
+			runBundle $file
+		fi
 	done
 elif [[ $1 = '--cached' ]]; then
 	for file in $(stagedSourceFiles); do
-		runBundle $file
+		if [[ $file != *.h ]]; then
+			runBundle $file
+		fi
 	done
 else
 	eval "set -- $(git rev-parse --sq --prefix "$GIT_PREFIX" "$@")"