Group markers by name rather than by prefix

[elboletaire]

As I explained in #66, I had to create many repeated prefixes in order to allow different case scenarios. I thought using the same name would group all the markers, but instead it shows different markers in the UI

I know by doing 66 I'll have the chance to have them grouped again, since I'll be able to use a single declaration for all the case scenarios, but may be worth considering to group them by name anyway. Having repeated marker names in the UI is weird and a bad UX.

[tpwalke2]

I'll aim for doing #66 first. I'll have to see how the grouping could work after that.