Add wintertodt-highlight

[47Y]

Adds various tile highlights for events within Wintertodt.

[runelite-github-app[bot]]

New plugin wintertodt-highlight: https://github.com/47Y/wintertodt/tree/4d19458c5f995928e70cca3c5a4d54d72d24f06f

[Nightfirecat]

We are discussing whether we believe this would be acceptable given the client guidelines. While Wintertodt isn't much of a boss, it is technically still a skilling boss, and at any other boss these changes would not be allowable.