feat(analyze): analyze code now return a flag that indicates if errors/warnings/etc. occurs

- `0`: **SUCCESS** - No issues detected.
        - `1`: **ERRORS** - Critical issues found.
        - `2`: **WARNINGS** - Non-critical issues detected.
        - `4`: **INFORMATIONS** - General information messages.
        - `8`: **HINTS** - Suggestions or improvements.

A return code 1 means error and 3 means there are errors and warning and so on.

Author: d-biehl