Rework block signs

[Sataniel98]

Please describe the use case or the problem your request is related to.
Block signs still use the deprecated byte magic value data system. They also don't automatically use the intuitively desired state, e.g. fences are lacking connections.

Describe the solution you'd like
A workaround that allows to enter block data without the need to use scripts for everything. Maybe further data that can be edited through the chat when the sign is right clicked. If possible, sign should mimick a player placing the block to automatically assure that the state is as desired.