Now the buttons actually do something - also added a build_type

gamedata.cpp

@@ -31,6 +31,7 @@ GameData::GameData()
     player1 = Player("player 1", PLAYER1_COLOUR);
     player2 = Player("player 2", PLAYER2_COLOUR);
     turn = &player1;
+    build_type = VERTEX_NONE;
 }
 
 GameData::~GameData() { }
@@ -236,6 +237,9 @@ void GameData::set_mode(Mode m)
     // Stay in MODE_SELECT (or maybe MODE_BUILD) when current is null
     if (current == NULL) return;
 
+    // If we're leaving MODE_BUILD, we should set the build_type back to none
+    if (mode == MODE_ATTACK && m != mode) build_type = VERTEX_NONE;
+
     // The other modes all require current to match the player
     if (dynamic_cast<GameVertex*>(current)->player == turn) mode = m;
 }