Follow user location + geosearch + location service updates

Changes

• don't keep user location in Redux. Map components should use watchPosition to update local state, and components that need one-time location status should use getCurrentPosition util
• ArrowButtons component to move around map for dev use
• DiscoverMap watches user location and calls geosearch when user has moved 100m from last call to geosearch
• got rid of MenuButton just inline the react-native-elements Icon as a button
• UserLocationMarker: lil dude that shows ur current location on the map. Replaces the defauly blue circle things from google maps
• locationUtils file deleted
• added dev button that takes u to tokyo for some reason
• CacheSubmitScreen now uses same map as discover screen
• deprecated location redux stuff
• stole distanceBetweenCoordinates function from internet

Pix

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