frontend: Split Qt UI Widget implementations into single files per class

frontend/widgets/OBSBasic_Dropfiles.cpp

@@ -1,17 +1,32 @@
-#include <QDragEnterEvent>
-#include <QDragLeaveEvent>
-#include <QDragMoveEvent>
-#include <QDropEvent>
+/******************************************************************************
+    Copyright (C) 2023 by Lain Bailey <lain@obsproject.com>
+                          Zachary Lund <admin@computerquip.com>
+                          Philippe Groarke <philippe.groarke@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 2 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 <http://www.gnu.org/licenses/>.
+******************************************************************************/
+
+#include "OBSBasic.hpp"
+
+#include <qt-wrappers.hpp>
+
 #include <QFileInfo>
 #include <QMimeData>
-#include <QUrlQuery>
 #ifdef _WIN32
 #include <QSettings>
 #endif
-#include <string>
-#include <qt-wrappers.hpp>
-
-#include "window-basic-main.hpp"
+#include <QUrlQuery>
 
 using namespace std;