App: "Bring me home" function

[devemux86]

@chrisjk

Increased sophistication in routing and associated menu or button controls is fine but adding stuff like a home button is just silly and unnecessary.

No extra buttons on map view, seems we have already too many.
Could be an extra option in bookmarks action dialog (available via bookmarks list or long press), as explained here:

App: Quick route function for bookmark entries

Actually no need for more buttons in toolbar which will complicate the UI. A routing button already exists there. All that remains can be a new entry in bookmark actions menu with the proposed workflow.