Send E-Mail on warning/error

[sfeilmeier]

From femsserver created by sfeilmeier : OpenEMS/femsserver#4

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request

Desired functionality.

When a warning or error is happening, send an email to [email protected].

[ebakir]

First: capture exceptions centralized