Refactors (#114)

* Update Engine.cpp

* fix

* Add Actors

* Refactor

* Update Game.cpp

* Refactors as per review

src/engine/courses/TestCourse.cpp

@@ -165,8 +165,6 @@ struct ActorSpawnData rocks[] = {
     rrxing->crossingTrigger = crossing1;
 }
 
-void TestCourse::Init() {}
-
 // Likely sets minimap boundaries
 void TestCourse::MinimapSettings() {
     D_8018D220 = reinterpret_cast<uint8_t (*)[1024]>(dma_textures(gTextureExhaust5, 0x443, 0x1000));