Code warning cleanup and add GPL license header to all CPP files

DrawVisitor.cpp

@@ -1,3 +1,22 @@
+/*
+ * This file is part of vimix - video live mixer
+ *
+ * **Copyright** (C) 2020-2021 Bruno Herbelin <bruno.herbelin@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+**/
+
 #include <algorithm>
 
 #include <glm/gtc/matrix_transform.hpp>
@@ -17,8 +36,8 @@ DrawVisitor::DrawVisitor(Node *nodetodraw, glm::mat4 projection, bool force): fo
 }
 
 DrawVisitor::DrawVisitor(const std::vector<Node *> &nodestodraw, glm::mat4 projection, bool force):
-    force_(force), targets_(nodestodraw), modelview_(glm::identity<glm::mat4>()),
-    projection_(projection), num_duplicat_(1), transform_duplicat_(glm::identity<glm::mat4>())
+    modelview_(glm::identity<glm::mat4>()), projection_(projection), targets_(nodestodraw), force_(force),
+    num_duplicat_(1), transform_duplicat_(glm::identity<glm::mat4>())
 {
 
 }
@@ -93,6 +112,6 @@ void DrawVisitor::visit(Switch &n)
     modelview_ = mv;
 }
 
-void DrawVisitor::visit(Primitive &n)
+void DrawVisitor::visit(Primitive &)
 {
 }