Suggestion: Wards auto issue a warning ping when they spot an enemy

Can be a special "ward has spotted an enemy ping".

Logic -

1). Only applies when an enemy enters vision of an existing ward. (Prevents pinging of an enemy already in vision when the ward is placed).

2), Pinging is debounced to 5 seconds, to prevent multiple pings when multiple enemies enter a ward's vision within a short period of time. (Cos we don't want to hear spammed pings from same ward).