Hit counter added

I added SDL3_ttf to the project and added a hit counter to it. Now every time the knight performs an attack, there will be a text showing how many attacks have been performed. Luckily it barely raises the GPU usage. 

For the next step, I will try to add a menu window using imgui so that some basic variables can be changed as the app is running.

After that, I will have to consider how to actually add more stuff to "play" in this game.