[nostaliga/core] Add Drawer system and make ImGui use configurable

src/nostalgia/core/context.hpp

@@ -12,10 +12,19 @@
 
 namespace nostalgia::core {
 
+class Context;
+
+class Drawer {
+	public:
+		virtual ~Drawer() = default;
+		virtual void draw(Context*) noexcept = 0;
+};
+
 // User Input Output
 class Context {
 	public:
 		ox::FileSystem *rom = nullptr;
+		ox::Vector<Drawer*, 5> drawer;
 	private:
 		void *m_windowerData = nullptr;
 		void *m_rendererData = nullptr;