evas/cserve2: Share paths of index tables with clients

evas/cserve2: Share paths of index tables with clients

- Send paths to all connected clients
- Send paths upon connection from a new client

- Client side:
 - Fast find opened images
 - Fast find loaded images
 - Optimize load by skipping socket wait

Also, remap indexes when needed (file size changed)
When index file grows, the clients are not notified, so they
must constantly check that their mapping matches the current array
size.