Commands rewrite (#357)

* began rewriting command system

* began rewriting command system

* updated formatting

* added new info command

* added new reload command

* updated new parse command to support all three parsing types

* added new commands to command router

* deleted old unused commands

* removed parserel

* added new expansion register and unregister commands

* deleted unused commands

* fixed annotation order

* added labels helper to command

* updated alias method to return an immutable view

* updated params param with unmodifiable annotation

* updated router to build an immutable map of the commands

* began rewriting command system

* updated formatting

* added new info command

* added new reload command

* updated new parse command to support all three parsing types

* added new commands to command router

* deleted old unused commands

* removed parserel

* added new expansion register and unregister commands

* deleted unused commands

* fixed annotation order

* added labels helper to command

* updated alias method to return an immutable view

* updated params param with unmodifiable annotation

* updated router to build an immutable map of the commands

* updated plugin class to use new command router

* updated switch to break on parse match

* updated register completions to suggest file names

* updated router to allow entering labels in any case

* updated parse command to send message to players as components

* added command dispatching parsing

* moved new commands into local package

* added helper functions for filtering and suggesting

* updated imports, updated tab completion to use helper functions

* added start of ecloud commands

* replace ecloud enable and disable commands with single toggle command evaluator

* deleted unused commands

* updated commands to use helper functions for suggesting

* updated downloading to use completablefuture, updated all methods to use streams exclusively

* updated to use the config instead of a null check

* deleted old commands system

* finished new command system

* updated to use new method from cloud manager

* fixed annotation ordering and added missing annotations

* updated ecloud subcommands to have a more specific permission

* updated plugin.yml with the new permissions, (and also fixed its formatting)

* fixed annotations intellij missed

* this should probably be there...

src/main/java/me/clip/placeholderapi/util/Constants.java

@@ -1,9 +0,0 @@
-package me.clip.placeholderapi.util;
-
-public class Constants {
-    public static final String ADMIN_PERMISSION = "placeholderapi.admin";
-    public static final String ECLOUD_PERMISSION = "placeholderapi.ecloud";
-    public static final String INFO_PERMISSION = "placeholderapi.info";
-    public static final String LIST_PERMISSION = "placeholderapi.list";
-    public static final String RELOAD_PERMISSION = "placeholderapi.reload";
-}