Use a list dropdown rather than a new buffer for the list of TODOs

[skarfacegc]

Would love to see the todo list as a dropdown (like package list does) rather than a new buffer/tab

[robcowie]

I'll see what I can do. It'll probably be a configurable option, something like

{
    "results_display_mode": "panel"
} 

I'm currently trying to reorg the plugin settings in a backwards-compatible way, then I need to fix the incompatibility with vintage mode. When I've done that, I'll get to this.

[jcolebrand]

I for one would prefer this to open into a new file