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/widget/toolbar/toolbar.cpp

@@ -28,6 +28,8 @@
 #include "widget/menu/menu.h"
 #include "ui/icons/icons.h"
 
+OLIVE_NAMESPACE_ENTER
+
 Toolbar::Toolbar(QWidget *parent) :
   QWidget(parent)
 {
@@ -183,3 +185,5 @@ void Toolbar::AddMenuItemTriggered(QAction* a)
 {
   emit AddableObjectChanged(static_cast<Tool::AddableObject>(a->data().toInt()));
 }
+
+OLIVE_NAMESPACE_EXIT

app/widget/toolbar/toolbar.h

@@ -27,6 +27,8 @@
 #include "widget/toolbar/toolbarbutton.h"
 #include "tool/tool.h"
 
+OLIVE_NAMESPACE_ENTER
+
 /**
  * @brief A widget containing buttons for all of Olive's application-wide tools.
  *
@@ -215,4 +217,6 @@ private slots:
 
 };
 
+OLIVE_NAMESPACE_EXIT
+
 #endif // TOOLBAR_H

app/widget/toolbar/toolbarbutton.cpp

@@ -20,6 +20,8 @@
 
 #include "toolbarbutton.h"
 
+OLIVE_NAMESPACE_ENTER
+
 ToolbarButton::ToolbarButton(QWidget *parent, const Tool::Item &tool) :
   QPushButton(parent),
   tool_(tool)
@@ -31,3 +33,5 @@ const Tool::Item &ToolbarButton::tool()
 {
   return tool_;
 }
+
+OLIVE_NAMESPACE_EXIT

app/widget/toolbar/toolbarbutton.h

@@ -25,6 +25,8 @@
 
 #include "tool/tool.h"
 
+OLIVE_NAMESPACE_ENTER
+
 /**
  * @brief Simple derived class of QPushButton to contain an Tool ID. Used as the main widget through Toolbar.
  */
@@ -57,4 +59,6 @@ private:
   Tool::Item tool_;
 };
 
+OLIVE_NAMESPACE_EXIT
+
 #endif // TOOLBARBUTTON_H