fix #268

[atburghardt]

game.is_multiplayer() is not working in on_init event.

• always give playeres starting items
• remove items in singleplayer from player when rock-chest is created
• rename function

[KiwiHawk]

I have concerns about removing items from players. Sea Block aims to play nicely with other mods. This would probably kill quick start mods. Removing starting bots or additional items added by other mods.

Probably better to give items on_player_created. Not sure if calling the Freeplay remote interface will work from there. Might need to give the items directly.

Documentation for remote interfaces: https://wiki.factorio.com/Tutorial:Script_interfaces

[atburghardt]

The interface did not work from on_player_created so im inserting the items into the player.