feat: add ProtocolLib support for deeper-level packet cancellation (#274)

* feat: add support for ProtocolLib packet-level state cancelling

* refactor: move commands to event listener, document ProtocolLib support

* docs: make Setup less claustrophobic

* fix: remove `@Getter` on `PlayerPacketAdapter`

* build: add missing license headers

* fix: inaccessible method on Paper

* test: add ProtocolLib to network spin test

* fix: whoops I targeted the wrong packets

* fix: bad command disabled check logic

* fix: final protocollib adjustments

docs/Setup.md

@@ -11,23 +11,28 @@ This will walk you through installing HuskSync on your network of Spigot servers
 ### 1. Install the jar
 - Place the plugin jar file in the `/plugins/` directory of each Spigot server.
 - You do not need to install HuskSync as a proxy plugin.
+- You can additionally install [ProtocolLib](https://www.spigotmc.org/resources/protocollib.1997/) for better locked user handling, and [Plan](https://www.spigotmc.org/resources/plan-player-analytics.32536/) for analytics.
+
 ### 2. Restart servers
 - Start, then stop every server to let HuskSync generate the [[config file]].
 - HuskSync will throw an error in the console and disable itself as it is unable to connect to the database. You haven't set the credentials yet, so this is expected.
-- Advanced users: If you'd prefer, you can just create one config.yml file and create symbolic links in each `/plugins/HuskSync/` folder to it to make updating it easier.
+- Advanced users: If you'd prefer, you can create one config.yml file and create symbolic links in each `/plugins/HuskSync/` folder to it to make updating it easier.
+
 ### 3. Enter Mysql & Redis database credentials
 - Navigate to the HuskSync config file on each server (`~/plugins/HuskSync/config.yml`)
 - Under `credentials` in the `database` section, enter the credentials of your (MySQL/MariaDB/MongoDB/PostgreSQL) Database. You shouldn't touch the `connection_pool` properties.
 - Under `credentials` in the `redis` section, enter the credentials of your Redis Database. If your Redis server doesn't have a password, leave the password blank as it is.
 - Unless you want to have multiple clusters of servers within your network, each with separate user data, you should not change the value of `cluster_id`.
+
 <details>
-<summary><b>For MongoDB Users</b></summary>
+<summary>Important &mdash; MongoDB Users</summary>
 
 - Navigate to the HuskSync config file on each server (`~/plugins/HuskSync/config.yml`)
 - Set `type` in the `database` section to `MONGO`
 - Under `credentials` in the `database` section, enter the credentials of your MongoDB Database. You shouldn't touch the `connection_pool` properties.
 <details>
-<summary><b>MongoDB Atlas</b></summary>
+
+<summary>Additional configuration for MongoDB Atlas users</summary>
 
 - Navigate to the HuskSync config file on each server (`~/plugins/HuskSync/config.yml`)
 - Set `using_atlas` in the `mongo_settings` section to `true`. 
@@ -41,6 +46,7 @@ This will walk you through installing HuskSync on your network of Spigot servers
 ### 4. Set server names in server.yml files
 - Navigate to the HuskSync server name file on each server (`~/plugins/HuskSync/server.yml`)
 - Set the `name:` of the server in this file to the ID of this server as defined in the config of your proxy (e.g., if this is the "hub" server you access with `/server hub`, put `'hub'` here)
+
 ### 5. Start every server again
 - Provided your MySQL and Redis credentials were correct, synchronization should begin as soon as you start your servers again.
 - If you need to import data from HuskSync v1.x or MySQLPlayerDataBridge, please see the guides below: