bridge: Set alias for routing table, extend basic routes.
general: Fix syntax errors and depricated syntax warnings.
tinc: Install tinc,create config and clone icvpn keys.

Clone icvpn repository, generates configuration and up,down-scripts
and bring the key file in place.
bird6: Add bird6 configuration for icvpn and local route exchange.

Local routing exchange is untested and currently unclear how to
feed with informations.