Vanilla Challenges

• Add vc convert command for convert points to item;
• Add vc reload soft for reload configurations only;
• Changes some placeholders of PlaceholderAPI;
• Changes of challengePlaceholders. P.S. if you see something strange with placeholders please reset your challenges files or modify the placeholder {points} with {challengePoint};
• Add new vc list interface, P.S. if you found some problems with placeholders please reset the Interfaces configuration in config.yml;
• Others minors fixs;
• Code optimization;
• Added others MockBukkit tests;

If you find some bugs please don't hesitate to report them via modrinth or discord, I will reply you as soon as possible and if you have any ideas I will be happy to listen to you.