Rename Renderer::create to Renderer::init

All functions that the create/destroy a global static singleton should
use the names init and shutdown, while any static functions that
return/take a new object should use the names create and destroy.

e.g.
void Renderer::init() and void Renderer::shutdown()
Window* Window::create() and void Window::destroy(Window* window)

engine/include/nova/render/renderer.h

@@ -13,7 +13,7 @@
 namespace Nova {
 	class NOVA_API Renderer {
 	  public:
-		static void create(RenderAPI api);
+		static void init(RenderAPI api);
 		static void shutdown();
 		static RenderDriver* get_driver();
 	};