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/System/File.cpp

@@ -3,7 +3,7 @@
 #include <stdio.h>
 #include <Spectre/System/File.h>
 
-namespace File
+namespace sp { namespace file
 {
 	std::string getBasename(const std::string& path) {
 
@@ -37,4 +37,4 @@ namespace File
 		}
 		return buf;
 	}
-};
+} } // namespace sp::file

source/System/Log.cpp

@@ -3,11 +3,14 @@
 #include <stdio.h>
 #include <Spectre/System/Log.h>
 
-void log(const char *fmt, ...) {
+namespace sp 
+{
+	void log(const char *fmt, ...) {
 
-	va_list vl;
+		va_list vl;
 
-	va_start(vl, fmt);
-	vfprintf(stderr, fmt, vl);
-	va_end(vl);
-}
+		va_start(vl, fmt);
+		vfprintf(stderr, fmt, vl);
+		va_end(vl);
+	}
+} // namespace sp

source/System/MessageHandler.cpp

@@ -2,6 +2,10 @@
 #include <Spectre/Display/Display.h>
 #include <Spectre/System/MessageHandler.h>
 
+namespace sp {
+
 void MessageHandler::onSizeChanged(Display* display, int width, int height)
 {
 }
+
+} // namespace sp

source/System/MessageQueue.cpp

@@ -1,6 +1,8 @@
 
 #include <Spectre/System/MessageQueue.h>
 
+namespace sp {
+
 void MessageQueue::postEvent(SysEvent& event)
 {
 	m_queue.push_back(event);
@@ -20,3 +22,5 @@ bool MessageQueue::isEmpty() const
 {
 	return m_queue.empty();
 }
+
+} // namespace sp

source/System/SystemEvent.cpp

@@ -1,7 +1,9 @@
 
 #include <Spectre/System/SystemEvent.h>
 
-SysEvent::SysEvent(Type type) : 
+namespace sp {
+
+SysEvent::SysEvent(Type type) :
 type	(type)
 {
 }
@@ -14,3 +16,5 @@ SysEvent SysEvent::sizeEvent(Display *display, int width, int height)
 	event.size.height = height;
 	return event;
 }
+
+} // namespace sp