Add LegacyBauSystem with adaptions to current SpigotCore

LegacyBauSystem/src/de/steamwar/bausystem/tracer/show/ShowMode.java

@@ -0,0 +1,28 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2020  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+package de.steamwar.bausystem.tracer.show;
+
+import de.steamwar.bausystem.tracer.TNTPosition;
+
+public interface ShowMode {
+    void show(TNTPosition position);
+
+    void hide();
+}