Implement Chilly Reception message

This is a bit hacky, but works in all the most common situations.

I wrote this a few weeks ago but was undecided about the `[premajor]`
tag format. I'm still not sure about it, but it's not like I'm going
to be any more sure if I keep waiting.

Author: Zarel

data/moves.ts

@@ -2484,11 +2484,20 @@ export const Moves: import('../sim/dex-moves').MoveDataTable = {
 		pp: 10,
 		priority: 0,
 		flags: {},
-		// TODO show prepare message before the "POKEMON used MOVE!" message
-		// This happens even before sleep shows its "POKEMON is fast asleep." message
+		priorityChargeCallback(source) {
+			source.addVolatile('chillyreception');
+		},
 		weather: 'snowscape',
 		selfSwitch: true,
 		secondary: null,
+		condition: {
+			duration: 1,
+			onBeforeMovePriority: 100,
+			onBeforeMove(source, target, move) {
+				if (move.id !== 'chillyreception') return;
+				this.add('-prepare', source, 'Chilly Reception', '[premajor]');
+			},
+		},
 		target: "all",
 		type: "Ice",
 	},

data/text/moves.ts

@@ -896,8 +896,7 @@ export const MovesText: { [id: IDEntry]: MoveText } = {
 		desc: "For 5 turns, the weather becomes Snow. The user switches out even if it is trapped and is replaced immediately by a selected party member. The user does not switch out if there are no unfainted party members.",
 		shortDesc: "Starts Snow. User switches out.",
 
-		// TODO needs to be implemented
-		activate: "  [POKEMON] is preparing to tell a chillingly bad joke!",
+		prepare: "  [POKEMON] is preparing to tell a chillingly bad joke!",
 	},
 	chipaway: {
 		name: "Chip Away",