Implement /unblacklistall command

This also introduces Punishments#roomUnblacklistAll to do the heavy lifting of this command.

commands.js

@@ -2149,6 +2149,27 @@ let commands = exports.commands = {
 	},
 	unblacklisthelp: ["/unblacklist [username] - Unblacklists the user from the room you are in. Requires: # & ~"],
 
+	unblacklistall: function (target, room, user) {
+		if (!this.can('editroom', null, room)) return false;
+
+		if (!target) {
+			user.lastCommand = '/unblacklistall';
+			this.errorReply("THIS WILL UNBLACKLIST ALL BLACKLISTED USERS IN THIS ROOM.");
+			this.errorReply("To confirm, use: /unblacklistall confirm");
+			return;
+		}
+		if (user.lastCommand !== '/unblacklistall' || target !== 'confirm') {
+			return this.parse('/help unblacklistall');
+		}
+
+		let unblacklisted = Punishments.roomUnblacklistAll(room);
+		if (!unblacklisted) return this.errorReply("No users are currently blacklisted in this room to unblacklist.");
+		let reply = `All blacklists in this room have been lifted by ${user.name}.`;
+		room.add(`|c|${user.getIdentity()}|/log ${reply}`).update();
+		this.logEntry(`${reply} This has unblacklisted: ${unblacklisted.join(', ')}`);
+	},
+	unblacklistallhelp: ["/unblacklistall - Unblacklists all blacklisted users in the current room. Requires #, &, ~"],
+
 	blacklists: 'showblacklist',
 	showbl: 'showblacklist',
 	showblacklist: function (target, room, user) {

punishments.js

@@ -726,6 +726,23 @@ Punishments.roomUnblacklist = function (room, userid) {
 	return Punishments.roomUnpunish(room, userid, 'BLACKLIST');
 };
 
+Punishments.roomUnblacklistAll = function (room) {
+	const roombans = Punishments.roomUserids.get(room.id);
+	if (!roombans) return false;
+
+	let unblacklisted = [];
+
+	roombans.forEach((punishment, userid) => {
+		if (punishment[0] === 'BLACKLIST') {
+			Punishments.roomUnblacklist(room, userid);
+			unblacklisted.push(userid);
+		}
+	});
+	if (unblacklisted.length === 0) return false;
+	Punishments.savePunishments();
+	return unblacklisted;
+};
+
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