Make Inventory Service GetExampleCommands Generic

[timjen3]

Currently InventoryCommandParser returns messages from GetExampleCommands that are specific to the demo:

return new string[]
{
	"Equip [miner] {itemName:stone pickaxe,equipAs:pick}",
	"Unequip [miner] {itemName:pick}",
	"Drop [miner] {itemName:stone pickaxe}",
	"Pickup [miner] {itemName:pebble}"
};

The default should be more generic.

Additionally you should be able to pass settings to override the defaults with settings.

{
	EquipExampleCommand = "",
	UnequipExampleCommand = "",
	DropExampleCommand = "",
	PickupExampleCommand = ""
}