Refactored and update Location Geocoding (#9359)

- Fix location so it is a regular database relation (this allows multiple devices to be accurately linked to one location and saves api calls)
- Parse coordinates from the location more consistently
- Add settings to webui
- ~~Used [PHP Geocoder](http://geocoder-php.org/), which has lots of backends and is well tested. (also includes reverse and geoip)~~
- Google Maps, Bing, Mapquest, and OpenStreetMap supported initially.
- Default to OpenStreetMap, which doesn't require a key.  They will liberally hand out bans if you exceed 1 query per second though.
- All other Geocoding APIs require an API key. (Google requires a credit card on file, but seems to be the most accurate)
- Update all (I think) sql queries to handle the new structure
- Remove final vestiges of override_sysLocation as a device attribute
- Update existing device groups and rules in DB
- Tested all APIs with good/bad location, no/bad/good key, and no connection.
- Cannot fix advanced queries that use location

This blocks #8868

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LibreNMS/Interfaces/Geocoder.php

@@ -0,0 +1,38 @@
+<?php
+/**
+ * Geocoder.php
+ *
+ * Interface to resolve an address or location string to latitude and longitude coordinates.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @package    LibreNMS
+ * @link       http://librenms.org
+ * @copyright  2018 Tony Murray
+ * @author     Tony Murray <murraytony@gmail.com>
+ */
+
+namespace LibreNMS\Interfaces;
+
+interface Geocoder
+{
+    /**
+     * Try to get the coordinates of a given address.
+     * If unsuccessful, the returned array will be empty
+     *
+     * @param string $address
+     * @return array ['lat' => 0, 'lng' => 0]
+     */
+    public function getCoordinates($address);
+}