Admin cmds, perms and descriptions for all cmds +

Additonal stuff: Fixed + refactored help command. Removed 'Usage: ' from all commands. Created 'player.hasPermission(permission)' function. Created default for Usage annotation. Created hashmap version of 'getHandlers' and renamed the original to getHandlersAsList()

src/main/java/emu/grasscutter/game/Account.java

@@ -105,6 +105,10 @@ public class Account {
 		if(this.permissions.contains(permission)) return false;
 		this.permissions.add(permission); return true;
 	}
+
+	public boolean hasPermission(String permission) {
+		return this.permissions.contains(permission) || this.permissions.contains("*") ? true : false;
+	}
 	
 	public boolean removePermission(String permission) {
 		return this.permissions.remove(permission);