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/renderworker.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 RENDERWORKER_H
 #define RENDERWORKER_H
 
@@ -9,6 +29,8 @@
 #include "node/output/track/track.h"
 #include "node/traverser.h"
 
+OLIVE_NAMESPACE_ENTER
+
 class RenderWorker : public QObject, public NodeTraverser
 {
   Q_OBJECT
@@ -22,12 +44,12 @@ public:
 public slots:
   void Close();
 
-  void Render(NodeDependency CurrentPath, qint64 job_time);
+  void Render(OLIVE_NAMESPACE::NodeDependency path, qint64 job_time);
 
 signals:
-  void CompletedCache(NodeDependency dep, NodeValueTable data, qint64 job_time);
+  void CompletedCache(OLIVE_NAMESPACE::NodeDependency dep, OLIVE_NAMESPACE::NodeValueTable data, qint64 job_time);
 
-  void FootageUnavailable(StreamPtr stream, Decoder::RetrieveState state, const TimeRange& range, const rational& stream_time);
+  void FootageUnavailable(OLIVE_NAMESPACE::StreamPtr stream, OLIVE_NAMESPACE::Decoder::RetrieveState state, const OLIVE_NAMESPACE::TimeRange& range, const OLIVE_NAMESPACE::rational& stream_time);
 
 protected:
   virtual bool InitInternal() = 0;
@@ -61,4 +83,6 @@ private:
 
 };
 
+OLIVE_NAMESPACE_EXIT
+
 #endif // RENDERWORKER_H