Added logic to detect if user is to merge to the left or right

[dgearhart]

Issue

The OSRM compatibility mode expects merge maneuvers to have an associated modifier. The modifier indicates if the user should merge to the left or to the right.
Fixes #1730

Examples of before vs. after - these were in the issue

Another Example before vs. after

Tasklist

• Test
• Review - you must request approval to merge any PR to master
• Generally use squash merge to rebase and clean comments before merging
• Update the changelog

[kevinkreiser]

need to update the header with the new version

[dgearhart]

I thought we do that when re release it

[kevinkreiser]

NM we'll make a release later!