[splittiming] Let's break things again! (222)

We introduced a new class, called "SongPosition", that replaces some instance variables in the GameState class. (GameState::m_Position).
Then, you also have it in PlayerState class which keeps track of the position based on their steps. (PlayerState::m_Position).

Fixing the build errors:
- GAMESTATE->m_fSomething should now be:
  - GAMESTATE->m_Position.m_fSomething
  - pPlayerState->m_Position.m_fSomething (or m_pPlayerState for some instance!)

src/PlayerState.h

@@ -3,6 +3,7 @@
 #ifndef PlayerState_H
 #define PlayerState_H
 
+#include "SongPosition.h"
 #include "Attack.h"
 #include "ModsGroup.h"
 #include "PlayerNumber.h"
@@ -38,6 +39,9 @@ public:
 	 */
 	MultiPlayer		m_mp;
 
+	// Music statistics:
+	SongPosition m_Position;
+
 	/**
 	 * @brief Change the PlayerOptions to their default.
 	 * @param l the level of mods to reset.