[nostalgia] Update nested namespaces for C++17

src/nostalgia/common/bounds.cpp

@@ -7,8 +7,7 @@
  */
 #include "bounds.hpp"
 
-namespace nostalgia {
-namespace common {
+namespace nostalgia::common {
 
 Bounds::Bounds(int x, int y, int w, int h) {
 	this->x = x;
@@ -42,4 +41,3 @@ Point Bounds::pt2() {
 }
 
 }
-}

src/nostalgia/common/bounds.hpp

@@ -9,8 +9,7 @@
 
 #include "point.hpp"
 
-namespace nostalgia {
-namespace common {
+namespace nostalgia::common {
 
 class Bounds {
 	public:
@@ -48,4 +47,3 @@ ox::Error model(T *io, Bounds *obj) {
 }
 
 }
-}

src/nostalgia/common/point.cpp

@@ -7,8 +7,7 @@
  */
 #include "point.hpp"
 
-namespace nostalgia {
-namespace common {
+namespace nostalgia::common {
 
 Point::Point() {
 }
@@ -122,4 +121,3 @@ Point Point::operator/=(int i) {
 }
 
 }
-}

src/nostalgia/common/point.hpp

@@ -10,8 +10,7 @@
 
 #include <ox/std/error.hpp>
 
-namespace nostalgia {
-namespace common {
+namespace nostalgia::common {
 
 class Point {
 	public:
@@ -68,4 +67,3 @@ ox::Error model(T *io, Point *obj) {
 }
 
 }
-}