various: encapsulate all code in the olive namespace to avoid name collisions

Large-scale code cleanup. Also adds a license to the top of all files that were
missing it.

app/undo/undocommand.cpp

@@ -1,7 +1,29 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 Olive Team
+
+  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 <http://www.gnu.org/licenses/>.
+
+***/
+
 #include "undocommand.h"
 
 #include "core.h"
 
+OLIVE_NAMESPACE_ENTER
+
 UndoCommand::UndoCommand(QUndoCommand *parent) :
   QUndoCommand(parent)
 {
@@ -31,3 +53,5 @@ void UndoCommand::undo_internal()
 {
   QUndoCommand::undo();
 }
+
+OLIVE_NAMESPACE_EXIT

app/undo/undocommand.h

@@ -1,8 +1,32 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 Olive Team
+
+  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 <http://www.gnu.org/licenses/>.
+
+***/
+
 #ifndef UNDOCOMMAND_H
 #define UNDOCOMMAND_H
 
 #include <QUndoCommand>
 
+#include "common/define.h"
+
+OLIVE_NAMESPACE_ENTER
+
 class UndoCommand : public QUndoCommand
 {
 public:
@@ -20,4 +44,6 @@ private:
 
 };
 
+OLIVE_NAMESPACE_EXIT
+
 #endif // UNDOCOMMAND_H

app/undo/undostack.cpp

@@ -20,6 +20,8 @@
 
 #include "undostack.h"
 
+OLIVE_NAMESPACE_ENTER
+
 void UndoStack::pushIfHasChildren(QUndoCommand *command)
 {
   if (command->childCount() > 0) {
@@ -28,3 +30,5 @@ void UndoStack::pushIfHasChildren(QUndoCommand *command)
     delete command;
   }
 }
+
+OLIVE_NAMESPACE_EXIT

app/undo/undostack.h

@@ -23,6 +23,10 @@
 
 #include <QUndoStack>
 
+#include "common/define.h"
+
+OLIVE_NAMESPACE_ENTER
+
 class UndoStack : public QUndoStack {
 public:
   /**
@@ -33,4 +37,6 @@ public:
   void pushIfHasChildren(QUndoCommand* command);
 };
 
+OLIVE_NAMESPACE_EXIT
+
 #endif // UNDOSTACK_H