Renamed messages from "option" to "method" to make things clearer

Added better support for tab completion and ignoring the first arg of falling blocks and item disguises, so /disguise fallingblock setburning - Is now possible
Fixed itemstack parsing returning illegal/unwanted air block

src/main/java/me/libraryaddict/disguise/utilities/parser/DisguisePermissions.java

@@ -282,7 +282,7 @@ public class DisguisePermissions {
 
                 // The permission is negated, and only has negated options. Should mean something, but to most people
                 // it's nonsense and should be ignored.
-                if (parsedPermission.isNegated() && !parsedPermission.options.values().contains(true)) {
+                if (parsedPermission.isNegated() && !parsedPermission.options.containsValue(true)) {
                     continue;
                 }