feat: move all link configuration to generic instead of ports

Configuration is same for one compilation, it cannot change.
Thus it does not make sense to be a port.
Resolves #13.

fix(lane): output user_data based on current link state in lane_alignment

chore: add documentation to the code

fix(link): make testbenches work in quartus, fix old testbenches

fix(link): correctly change next_error when generation order

chore: fix formatting

feat(link): output frame_character from data link, add user_data to character

feat(link): add lane alignment