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/panel/param/param.cpp

@@ -20,6 +20,8 @@
 
 #include "param.h"
 
+OLIVE_NAMESPACE_ENTER
+
 ParamPanel::ParamPanel(QWidget* parent) :
   TimeBasedPanel(parent)
 {
@@ -55,3 +57,5 @@ void ParamPanel::Retranslate()
     SetSubtitle(tr("(multiple)"));
   }
 }
+
+OLIVE_NAMESPACE_EXIT

app/panel/param/param.h

@@ -24,6 +24,8 @@
 #include "panel/timebased/timebased.h"
 #include "widget/nodeparamview/nodeparamview.h"
 
+OLIVE_NAMESPACE_ENTER
+
 class ParamPanel : public TimeBasedPanel
 {
   Q_OBJECT
@@ -43,4 +45,6 @@ protected:
 
 };
 
+OLIVE_NAMESPACE_EXIT
+
 #endif // PARAM_H