Adds a lot of empty classes with todos

Adds commands and permissions to plugin.yml
Uses the Spigot API instead of the Paper API
Reduces the Java version to 16, just in case.
Adds a lot of empty classes to show the intended plugin structure.

src/main/resources/plugin.yml

@@ -3,3 +3,52 @@ version: '${project.version}'
 main: net.knarcraft.dropper.Dropper
 api-version: 1.19
 description: A plugin for dropper mini-games
+
+commands:
+  dropperlist:
+    permission: dropper.join
+    usage: /<command>
+    description: Used to list all current dropper arenas
+  dropperjoin:
+    permission: dropper.join
+    usage: |
+      /<command> <arena> [mode]
+      Mode can be used to select challenge modes which can be played after beating the arena.
+      deaths = A least-deaths competitive game-mode
+      time = A shortest-time competitive game-mode
+    description: Used to join a dropper arena
+  dropperleave:
+    permission: dropper.join
+    usage: /<command>
+    description: Used to leave the current dropper arena
+  droppercreate:
+    permission: dropper.create
+    usage: /<command> (Details not finalized)
+    description: Used to create a new dropper arena
+  dropperedit:
+    permission: dropper.edit
+    usage: /<command> (Details not finalized)
+    description: Used to edit an existing dropper arena
+  dropperremove:
+    permission: dropper.remove
+    usage: /<command> <arena>
+    description: Used to remove an existing dropper arena
+permissions:
+  dropper.admin:
+    children:
+      - dropper.join
+      - dropper.create
+      - dropper.edit
+      - dropper.remove
+  dropper.join:
+    description: Allows a player to participate in dropper arenas
+    default: true
+  dropper.create:
+    description: Allows a player to create a new dropper arena
+    default: op
+  dropper.edit:
+    description: Allows a player to edit an existing dropper arena
+    default: op
+  dropper.remove:
+    description: Allows a player to remove a dropper arena
+    default: op