Remove Roots_Nav_Walker as default for all menu

[leopuleo]

I love how Roots_Nav_Walker() create menu html.
But, I believe that apply by default to all menus is too much.

Often I use the menu widget to show complex menus with sub-element.
In these situations sub-elements are wrapped in dropdown menus, which is fine for primary menu but not for aside or footer.

I suggest to:

• remove Roots_Nav_Walker() as default for all menus
• add Roots_Nav_Walker() to Primary menu

In this way:

• if user wants another menu using Roots_Nav_Walker(), can simply copy and paste the code in header.php
• user can add other custom Nav_Walkers
• Widget menus can have as many level as user likes.

[JulienMelissas]

👍 - I ran into this the other day and while I love what we do with the walker class, I don't like that it gets in the way sometimes.

@leopuleo If this is approved (this decision isn't up to me), we're going to ask you to squash your commits, so you may as well do that now 😉

[leopuleo]

Thanks @JulienMelissas, I prefere wait, so I don't have to squash twice if further commits are coming... 😄

[retlehs]

👍 squash and we're good to go

[leopuleo]

Here we are..squashed! 😃

[leopuleo]

👍 Thank you guys!