New Plugins: Keys and Keys on map

Plugin Keys let you input and store the count of key of a portal.
Plugin Keys on map show the keys on portals in map.

Plugin Keys
![Plugin Keys](https://github.com/Xelio/ingress-intel-total-conversion/raw/9a2e004ab8f62192c23edca7bb6b6f3fda2aef45/screenshots/plugin_keys.png)

Plugin Keys on map
![Plugin Keys on map](https://github.com/Xelio/ingress-intel-total-conversion/raw/9a2e004ab8f62192c23edca7bb6b6f3fda2aef45/screenshots/plugin_keys_on_map.png)