Rename Display to Window.

It makes more sense to be consistent and always call it window.

source/Window/WindowDescription.cpp

@@ -0,0 +1,18 @@
+
+#include <Spectre/Window/WindowDescription.h>
+
+namespace sp {
+
+WindowDescription::WindowDescription() :
+mode		(),
+decoration	(WindowDecorate::Default)
+{
+}
+
+WindowDescription::WindowDescription(DisplayMode mode, unsigned decoration) :
+mode		(mode),
+decoration	(decoration)
+{
+}
+
+} // namespace sp