Allow multiple route simulations with NavigationView

[danesfeder]

Fixes #1721

We were only allowing simulation of the first route with the NavigationView. This was because with the new location APIs, we need to re-request updates in order for the simulation to begin.

I took this opportunity to make LocationEngineConductor package-private as well. I don't believe this class needs to be public as it's used internally in the NavigationView.

[codecov-io]

Codecov Report

Merging #1724 into master will increase coverage by 0.01%.
The diff coverage is 50%.

@@             Coverage Diff              @@
##             master    #1724      +/-   ##
============================================
+ Coverage     29.27%   29.29%   +0.01%     
- Complexity      821      823       +2     
============================================
  Files           212      212              
  Lines          8045     8050       +5     
  Branches        626      626              
============================================
+ Hits           2355     2358       +3     
  Misses         5465     5465              
- Partials        225      227       +2

[Guardiola31337]

Thanks for the quick fix @danesfeder 🚀