Decouple emulator and frontend code

src/panda_sdl/main.cpp

@@ -1,12 +1,11 @@
-#include "emulator.hpp"
+#include "panda_sdl/frontend_sdl.hpp"
 
 int main(int argc, char *argv[]) {
-	Emulator emu;
-	emu.initGraphicsContext();
+	FrontendSDL frontend;
 
 	if (argc > 1) {
 		auto romPath = std::filesystem::current_path() / argv[1];
-		if (!emu.loadROM(romPath)) {
+		if (!frontend.loadROM(romPath)) {
 			// For some reason just .c_str() doesn't show the proper path
 			Helpers::panic("Failed to load ROM file: %s", romPath.string().c_str());
 		}
@@ -14,5 +13,5 @@ int main(int argc, char *argv[]) {
 		printf("No ROM inserted! Load a ROM by dragging and dropping it into the emulator window!\n");
 	}
 
-	emu.run();
+	frontend.run();
 }