use generic sweetest model in twig-based forwarder

[toschneck]

implement after #310

• Use Sweetest Model for all twig based Forwarder as data model.
• separate Forwarder in independent modules
  • Basic Forwarder Module
  • Gearman Forwarder
  • Check_MK Forwarder
  • ....

[toschneck]

1. migrate all forwarder to twig-based template, currently missing:

• Incinga
• stdout

2. transfer forward in generic swettest model and use them as library