Client actors spawned during gameplay, e.g. smoke emitters, are not deleted on new round or reset game

[Matt Hands]

Best example is smoke grenades or shells. On game reset (admin "resetgame" command) or on moving to new round on same map, these actors do not get deleted on a net client. Results in the smoke cloud still being present when the map re-starts.

Happens because a map re-start causes Reset() function to be called on all actors - but only on an authority role.

[Matt Hands]

Fix for ResetGame implemented in commit 773790f and improved in commit 947d9ba.

Since realised same problem occurs on map change if playing more than 1 round. Have similar fix; will commit.

[Matt Hands]

Map change fix added in commit a7c583c.