video_core: Eliminate the g_renderer global variable

We move the initialization of the renderer to the core class, while
keeping the creation of it and any other specifics in video_core. This
way we can ensure that the renderer is initialized and doesn't give
unfettered access to the renderer. This also makes dependencies on types
more explicit.

For example, the GPU class doesn't need to depend on the
existence of a renderer, it only needs to care about whether or not it
has a rasterizer, but since it was accessing the global variable, it was
also making the renderer a part of its dependency chain. By adjusting
the interface, we can get rid of this dependency.

src/video_core/renderer_base.h

@@ -13,6 +13,8 @@
 
 class EmuWindow;
 
+namespace VideoCore {
+
 class RendererBase : NonCopyable {
 public:
     /// Used to reference a framebuffer
@@ -44,7 +46,7 @@ public:
         return m_current_frame;
     }
 
-    VideoCore::RasterizerInterface* Rasterizer() const {
+    RasterizerInterface* Rasterizer() const {
         return rasterizer.get();
     }
 
@@ -52,7 +54,9 @@ public:
 
 protected:
     EmuWindow& render_window; ///< Reference to the render window handle.
-    std::unique_ptr<VideoCore::RasterizerInterface> rasterizer;
+    std::unique_ptr<RasterizerInterface> rasterizer;
     f32 m_current_fps = 0.0f; ///< Current framerate, should be set by the renderer
     int m_current_frame = 0;  ///< Current frame, should be set by the renderer
 };
+
+} // namespace VideoCore