[Analyzer] Add 'Skipped' status and message type

[sscargal]

Allow rules to be skipped if not executed and report them

Add REPORT_COUNT_SKIPPED and STR_SKIPPED to the existing options:

analyzer/analyzer:  REPORT_COUNT_PASSED=0
analyzer/analyzer:  REPORT_COUNT_FAILED=0
analyzer/analyzer:  REPORT_COUNT_INFO=0
analyzer/analyzer:  REPORT_COUNT_WARNINGS=0
analyzer/analyzer:  echo "${STR_PASSED} = ${REPORT_COUNT_PASSED}"
analyzer/analyzer:  echo "${STR_FAIL} = ${REPORT_COUNT_FAILED}"
analyzer/analyzer:  echo "${STR_INFO} = ${REPORT_COUNT_INFO}"
analyzer/analyzer:  echo "${STR_WARN} = ${REPORT_COUNT_WARNINGS}"

[sscargal]

See #140