[FEATURE] add anchor point (left/center/right) + sign hanging mode (recto/verso)

[3nids]

demo data has been improved

[3nids]

we have some display issues that are arising (a bit more than before) due to the display of 2 signs on the same row/level (left+right)
example:

if we explode it a bit (offset):

what we could do:

1. detect when there is a single type of anchor (left/center/right) for the azimut and in this case center the signs. In the above example, the 2 columns starting with Neuchâtel and Vallorbe would get centered (at the cost of losing the visual information of the anchor)
2. try to calculate when there is n overlap of signs and add an offset for the aizmut. In the example, the other columns (highway + Bern/Vevey) would get shifted to avoid the overlap