Advent Calendar

Added a PlaceholderAPI placeholder %adventcalendar_total_claims% which can be used in any other plugin that supports PlaceholderAPI to show how many gifts the player has claimed! PlaceholderAPI is still not required if you don't want the features so don't worry!

I also removed a line I left over from testing that would print "LEFT" every time you clicked an item in the preview calendar... sorry!

If you encounter any bugs or have any suggestions, please join my development discord https://discord.gg/GMkjWd2Kun. As this plugin is free, if you would like to contribute, please consider buying me a coffee. I am open to any and all feedback! Happy Holidays and thank you for using my plugin!