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/render/backend/indexmanager.h

@@ -1,3 +1,23 @@
+/***
+
+  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 INDEXMANAGER_H
 #define INDEXMANAGER_H
 
@@ -7,11 +27,13 @@
 #include "task/conform/conform.h"
 #include "task/index/index.h"
 
+OLIVE_NAMESPACE_ENTER
+
 class IndexManager : public QObject
 {
   Q_OBJECT
 public:
-  IndexManager();
+  IndexManager() = default;
 
   static void CreateInstance();
   static IndexManager* instance();
@@ -21,12 +43,12 @@ public:
   bool IsConforming(AudioStreamPtr stream, const AudioRenderingParams& params) const;
 
 public slots:
-  void StartIndexingStream(StreamPtr stream);
-  void StartConformingStream(AudioStreamPtr stream, const AudioRenderingParams& params);
+  void StartIndexingStream(OLIVE_NAMESPACE::StreamPtr stream);
+  void StartConformingStream(OLIVE_NAMESPACE::AudioStreamPtr stream, OLIVE_NAMESPACE::AudioRenderingParams params);
 
 signals:
   void StreamIndexUpdated(Stream* stream);
-  void StreamConformAppended(Stream* stream, const AudioRenderingParams& params);
+  void StreamConformAppended(Stream* stream, OLIVE_NAMESPACE::AudioRenderingParams params);
 
 private:
   static IndexManager* instance_;
@@ -55,4 +77,6 @@ private slots:
 
 };
 
+OLIVE_NAMESPACE_EXIT
+
 #endif // INDEXMANAGER_H