Refactor distance sensors to zones

[CarsonF]

• Zones are now the polling component(s) instead of Roode.
• Refactored sensor config to have zones.entry/exit instead of duplicate entries with different suffixes. https://github.com/Lyr3x/Roode/compare/dev...CarsonF:distance-to-zone?expand=1#diff-79d9beac237fb837d56ad984858585e78859deaab40346372801d9d382b82e02L116-R126 See diff for example.
• Fixed occupancy sensor usage when user doesn't define them. We'll use the zone ones internally, but skip the roode union one.

Will update other sensors in future PR.