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Viewing changes to include/location_service/com/ubuntu/location/proxy_provider.h

This MP consolidates multiple related changes together, with the goal of:

(1.) Make the service instance accessible via a cli. Useful for testing scenarios.
(2.) To cut down time-to-first-fix (ttff) by:
  (2.1) Leveraging SUPL and other supplementary data downloaded over ordinary data connections.
  (2.2) Enabling network-based positioning providers to acquire fast position estimates.

In more detail:

* Added tests for daemon and cli.
* Unified daemon and cli header and implementation files.
* Add a command-line interface to the service.
* Split up provider selection policy to rely on an interface ProviderEnumerator to ease in testing.
* Trimmed down on types.
* Removed connectivity API draft to prepare for simpler approach.
* Refactored includes.
* Added a configuration option to handle cell and wifi ID reporting.
* Add a mock for a connectivity API exposed to providers and reporters.
* Add units for connectivity api.
* Refactor cell class into namespace radio. Fixes: 1226204, 1248973, 1281817

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Lines of Context:
include/location_service/com/ubuntu/location/proxy_provider.h
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#ifndef LOCATION_SERVICE_COM_UBUNTU_LOCATION_PROXY_PROVIDER_H_
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#define LOCATION_SERVICE_COM_UBUNTU_LOCATION_PROXY_PROVIDER_H_
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#include "com/ubuntu/location/provider.h"
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#include "com/ubuntu/location/provider_selection_policy.h"
 
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#include <com/ubuntu/location/provider.h>
 
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#include <com/ubuntu/location/provider_selection_policy.h>
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#include <bitset>
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#include <memory>
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    ProxyProvider(const ProviderSelection& selection);
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    ~ProxyProvider() noexcept;
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    ChannelConnection subscribe_to_position_updates(std::function<void(const Update<Position>&)> f);
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    ChannelConnection subscribe_to_heading_updates(std::function<void(const Update<Heading>&)> f);
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    ChannelConnection subscribe_to_velocity_updates(std::function<void(const Update<Velocity>&)> f);
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    virtual void start_position_updates();
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    virtual void stop_position_updates();
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    virtual void stop_heading_updates();
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private:
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    Provider::Ptr position_updates_provider;
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    Provider::Ptr heading_updates_provider;
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    Provider::Ptr velocity_updates_provider;
 
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    ProviderSelection providers;
 
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    struct
 
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    {
 
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        core::ScopedConnection position_updates;
 
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        core::ScopedConnection heading_updates;
 
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        core::ScopedConnection velocity_updates;
 
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    } connections;
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};
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}
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}