Add email override Interceptor

[NMantek]

This MR adds a new Interceptor used to override email settings using conditions similar to the allready existing conditonBlocks.

Below is a example config for the new Interceptor.

  saveInterceptors {
    EmailOverride {
      model = EmailOverrideInterceptor
      config {
        1 {
          conditions.OR1.AND1 = 1.field.select = firstValue
          isTrue {
            admin {
              senderEmail = firstEmail@domain.tld
            }
          }
          else {
            admin {
              senderEmail = secondEmail@domain.tld
            }
          }
        }
      }
    }
  }