Move everything from global namespace to "sp" namespace

When writing the X11 (linux) implementation there was a problem with X11 defining a "Display" type and we also have a Display class in the engine.

So to fix that problem and minimize the risk for running into other name conflicts. We move everything from global namespace.

source/Display/Display.cpp

@@ -5,6 +5,8 @@
 #include <Spectre/System/SystemEvent.h>
 #include <Platform/PlatformDisplay.h>
 
+namespace sp {
+
 #define CAPTION_DEFAULT "Spectre"
 #define ICON_DEFAULT "./assets/app.ico"
 
@@ -147,4 +149,6 @@ void Display::onReshape(int width, int height)
 {
 	// Resize context if the windows resizes.
 	m_context->setSize(width, height);
-}
+}
+
+} // namespace sp

source/Display/DisplayDescription.cpp

@@ -1,6 +1,8 @@
 
 #include <Spectre/Display/DisplayDescription.h>
 
+namespace sp {
+
 DisplayDescription::DisplayDescription() :
 mode		(),
 decoration	(DisplayDecorate::Default)
@@ -11,4 +13,6 @@ DisplayDescription::DisplayDescription(DisplayMode mode, unsigned decoration) :
 mode		(mode),
 decoration	(decoration)
 {
-}
+}
+
+} // namespace sp

source/Display/DisplayMode.cpp

@@ -3,9 +3,11 @@
 #include <Platform/PlatformMisc.h>
 #include <algorithm>
 
+namespace sp {
+
 struct DisplayModeCmp
 {
-	inline bool operator() (const DisplayMode& a, const DisplayMode& b) 
+	inline bool operator() (const DisplayMode& a, const DisplayMode& b)
 	{
 		if (a.bpp == b.bpp) {
 			if (a.width == b.width) {
@@ -51,4 +53,6 @@ std::vector<DisplayMode> DisplayMode::getFullscreenModes()
 DisplayMode DisplayMode::getDesktopMode()
 {
 	return PlatformMisc::GetDesktopMode();
-}
+}
+
+} // namespace sp

source/Display/GLContext.cpp

@@ -3,11 +3,13 @@
 
 #ifdef _WIN32
 #include <Platform/Win32/Win32GLContext.h>
-typedef Win32GLContext ContextType;
+typedef sp::Win32GLContext ContextType;
 #else
 #error "No GLContext implementation exists"
 #endif
 
+namespace sp {
+
 GLContext* GLContext::create()
 {
 	return new ContextType();
@@ -17,3 +19,5 @@ GLContext::~GLContext()
 {
 	// Nothing to do.
 }
+
+} // namespace sp