Added: Support for Minecraft 1.21.6/1.21.7

Added: tags.Tags now also has Get/Set/Has for PersistentDataContainer alongside ItemStack, the way the original ValorlessUtils.Tags has.

Added: Boolean - Server.VersionHigherOrEqualTo(Version version).
Returns true is the server's version is the higher or the same as the value given.

Added: Boolean - Server.VersionEqualTo(Version version).
Returns true is the server's version is the same as the value given.

Changed: config.GetFloat() has been marked as deprecated, and replaced with config.GetDouble().
This was a mixup I made early on, before I knew the difference between the two.

Changed: Config backups are now saved as .txt instead of .yml, for plugins where all .yml files in a folder is loaded.