Expand *getinventorylist() script command - favorite field

[Emistry]

Pull Request Prelude

• I have followed proper Hercules code styling.
• I have read and understood the contribution guidelines before making this PR.
• I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

• return an array @inventorylist_favorite
• indicate whether an item in the inventory are located inside favorite tab or not.

Issues addressed:
Allow npc script to detect if an item are located in favorite tab.

Sample:

prontera,155,181,5	script	sample	4_F_KAFRA1,{
	getinventorylist;
	mes "Favourite Items";
	for (.@i = 0; .@i < @inventorylist_count; .@i++) {
		if (@inventorylist_favorite[.@i]) 
			mes "~ "+ getitemname(@inventorylist_id[.@i]);
	}
	close;
}

[HerculesWSAPI]

This change is