Add the remaining guide sign toward phrases

[dgearhart]

Issue

Add guide sign toward phrases for the following phrase blocks:

1. keep
2. keep_verbal
3. merge
4. merge_verbal
5. enter_ferry
6. enter_ferry_verbal

Example#1

< BEFORE
< 33: Keep right to take A-66/Autovía Ruta de la Plata.
<    VERBAL_ALERT: Keep right to take A-66.
<    VERBAL_PRE: Keep right to take A-66, Autovía Ruta de la Plata.
> AFTER
> 33: Keep right toward A-66/León/Oviedo/A-52.
>    VERBAL_ALERT: Keep right toward A-66.
>    VERBAL_PRE: Keep right toward A-66, León.

Example#2

< BEFORE
< 3: Merge left.
<    VERBAL_PRE: Merge left.
> AFTER
> 3: Merge left toward US 22/Ebensburg/Hollidaysburg.
>    VERBAL_PRE: Merge left toward U.S. 22, Ebensburg.

Tasklist

• RAD tests
• Add gurka tests
• Add #fixes with the issue number that this PR addresses
• Generally use squash merge to rebase and clean comments before merging
• Update the changelog

[danpaz]

Would it make sense to add a test for KeepLeftToward?

[dgearhart]

@danpaz yes, i will add

[danpaz]

Is this used?

[dgearhart]

@danpaz yes, static class member

[danpaz]

Gurka tests look great 👍 Approved