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Fix for servers being returned that are less performant than the closest #23

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This PR rewrites the Closest function to add a MaxDeviation field, which allows a configurable maximum distance from the closest server to be used. This will prevent issues when there's a close (<50km) server, and then the next two closest are 500km away.

Changes

  • Adds MaxDeviation (maxDeviation in yaml) which defaults to 50km
  • Changes the default behavior to only return one server instead of a rotating list of three
  • Reverts to caching all items in a slice instead of a single item to maintain flexibility, but keeps a "fast path" to bypass the random selection/weighting code.
  • Removes localServer checks which could cause issues with countries that only have one server, or servers that are nowhere near the user. For example, if a server is in Vancouver, BC in Canada, and a user from Toronto wants to get a mirror, it would prefer and return the Vancouver mirror instead of a closer Chicago or New York one. This is resolved by using one server and the MaxDeviation fields.

- Provides better documentation on the topChoices field
- Changes default to only return the best server instead of top 3
- Avoids distant servers (>50km by default) from the top choice when topChoices is enabled, while still keeping similar servers (same location, etc)
- Reverts localized servers due to issues with large countries and limited server selection
- Prepare code for unit tests
- Mock unit tests in ideal cases
- Changes geolocation to a provider for use of either API or Mocking
- Add server tests for testing closest/choices
- Adds test for deviation checking
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