ISO15118-20 Beta release

[SebaLukas]

Describe your changes

Adding a ISO15118-20 poc. These ISO15118-20 features are supported rudimentary:

• DC, DC_BPT
• Scheduled Mode
• only EIM

Issue ticket number and link

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [ ] I have made corresponding changes to the documentation
• [x] I read the contribution documentation and made sure that my changes meet its requirements

[SebaLukas]

Todos:

• DCO - done
• Codacy - done mostly false positives
• Clang format - done
• Update Branch - done
• Squash some commits together? - done
• Clean up unit tests - done
• Build, check unit test and test with sil - done
• Update Readme.md - done