Improvements for pedestrian forks, pedestrian roundabouts, and continue maneuvers

[dgearhart]

Issue

1. Need to improve pedestrian guidance for the following:

   • Forks
   • Roundabouts

2. Also, improve guidance when continuing straight and not needing to turn

This PR adds logic to detect and announce forks for pedestrians. This improves some of the items discussed in #1761
This PR removed the enter/exit roundabout announcements for pedestrians - please see examples below.
This PR fixed #1533 by announcing continue instead of bear left or right when continuing straight through an intersection.
This PR fixed the to stay on announcement for forks

Pedestrian fork example

Maneuver#4 is new - now the user knows to keep right at the fork in the walkway

Pedestrian roundabout example#1

< BEFORE
< 2: Continue on US 30 West/East King Street.
< 3: Enter the roundabout and take the 1st exit.
< 4: Exit the roundabout onto North Queen Street/PA 194.
> AFTER
> 2: Keep right to stay on US 30 West.
> 3: Keep right to take North Queen Street/PA 194.

Pedestrian roundabout example#2

< BEFORE
< 2: Enter the roundabout and take the 1st exit.
< 3: Exit the roundabout onto US 30/Lincoln Way West.
> AFTER
> 2: Turn right onto US 30/Center Square.
> 3: Turn right onto US 30/Lincoln Way West.

Bear vs. straight example#1

< BEFORE
< 2: Bear left onto Hockersville Road.
> AFTER
> 2: Continue on Hockersville Road.

Bear vs. straight example#2

< BEFORE
< 2: Bear right onto Colonial Road.
> AFTER
> 2: Continue on Colonial Road.

Tasklist

• Test
• Add before and after examples
• Review - you must request approval to merge any PR to master
• Add #fixes with the issue number that this PR addresses
• Generally use squash merge to rebase and clean comments before merging
• Update the changelog