Add e3dc wallbox ctrl

[mk-devs]

Added functionality for E3DC Wallboxes connected to E3DC Portal (especially for the old E3DC CAN-BUS Wallbox)
Need updated go-rscp package 0.2.2

[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• The guard if phases && false effectively disables your phase‐switching code—either remove this dead branch or fully implement and test the 1p/3p logic so it isn’t hard‐disabled.
• Consider replacing the magic literal 11000 for override available power in Enable() with a named constant or config parameter to make its purpose and units clearer.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The guard `if phases && false` effectively disables your phase‐switching code—either remove this dead branch or fully implement and test the 1p/3p logic so it isn’t hard‐disabled.
- Consider replacing the magic literal `11000` for override available power in Enable() with a named constant or config parameter to make its purpose and units clearer.

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