Added TestState2 and got the game engine to sucessfully swtich to another state. Next is to add a TestState3 that opens on top of TestState1, pausing it, and then popping TestState3 and resuming TestState1 before going to TestState2

Got the GameEngine, GameState, and TestState classes working and running in enginetest.cpp. Goes through three game loops and then closes. Will add another state next

Added functionality to GameEngine and the testing gamestate Introstate, almost ready to test the engine and game flow