Fix TD3511 and ISKRAemeco MT174 issues

- Fix TD3511 and ISKRAemeco MT174 from #46 thanks to Udo
- Additional code beautification, alignment of white spaces and brackets
- Moved version to 0.3.8

Big thanks to Udo and Michael for their patience!

Note: C codes have been removed from OBIS parsing to eliminate crash.

Hint: use `?ts=4` in the commit preview to see proper alignment.