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/Graphics/Font/FontDriver.cpp

@@ -1,6 +1,8 @@
 
 #include "FontDriver.h"
 
+namespace sp {
+
 FontDriver::FontDriver() :
 m_hinting	(true)
 {
@@ -9,4 +11,6 @@ m_hinting	(true)
 void FontDriver::setHinting(bool value)
 {
 	m_hinting = value;
-}
+}
+
+} // namespace sp

source/Graphics/Font/FontDriver.h

@@ -6,6 +6,8 @@
 #include <Spectre/Graphics/Image.h>
 #include <Spectre/Graphics/Font.h>
 
+namespace sp {
+
 class FontDriver
 {
 public :
@@ -28,4 +30,6 @@ protected :
 	bool m_hinting;
 };
 
+} // namespace sp
+
 #endif /* SPECTRE_GRAPHICS_FONT_FONTDRIVER_H */

source/Graphics/Font/FreeTypeDriver.cpp

@@ -9,6 +9,8 @@
 #include "FreeTypeError.h"
 #include "FreeTypeDriver.h"
 
+namespace sp {
+
 class LibWrapper
 {
 public :
@@ -165,4 +167,6 @@ Font::Glyph FreeTypeDriver::loadGlyph(unsigned int codepoint, Image& img, unsign
 std::string FreeTypeDriver::getName()
 {
 	return m_face->family_name;
-}
+}
+
+} // namespace

source/Graphics/Font/FreeTypeDriver.h

@@ -5,8 +5,11 @@
 #include <ft2build.h>
 #include FT_FREETYPE_H
 
+#include <string>
 #include "FontDriver.h"
 
+namespace sp {
+
 class FreeTypeDriver : public FontDriver
 {
 public:
@@ -26,4 +29,6 @@ private :
 	FT_Face m_face;
 };
 
+} // namespace sp
+
 #endif /* SPECTRE_GRAPHICS_FONT_FREETYPEDRIVER_H */