Icons for lock entities and their state

[kevin-brown]

https://www.home-assistant.io/integrations/lock/

Currently the plugin does not have anything for handling locks within the factory for entity images, which isn't surprising because they're not the most common.

Recommended mapping (JS-ish pseudocode):

let icon = Mdi.mdiLockQuestion;
let color = this.colors.unavailable;

if (state === 'locked') {
    icon = Mdi.mdiLock;
    color = this.colors.ok;
} else if (state === 'locking') {
    icon = Mdi.mdiLockClock;
    color = this.colors.active;
} else if (state === 'unlocked') {
    icon = Mdi.mdiLockOpen;
    color = this.colors.warn;
}