Stop demo when gameworld is reset

Currently the per tee demos are only stopped when a character dies.
But the Reset() method in the gameworld destroys characters without
killing them.

This allows to do world resets without calling gamecontext shutdown
while sv_player_demo_record is active. Which is nice for round based
game modes.

```C++
void CGameWorld::Reset()
{
	// reset all entities
	for(auto *pEnt : m_apFirstEntityTypes)
		for(; pEnt;)
		{
			m_pNextTraverseEntity = pEnt->m_pNextTypeEntity;
			pEnt->Reset();
			pEnt = m_pNextTraverseEntity;
		}
	RemoveEntities();

	GameServer()->m_pController->OnReset();
	RemoveEntities();

	m_ResetRequested = false;

	GameServer()->CreateAllEntities(false);
}
```

src/game/server/entities/character.cpp

@@ -48,6 +48,7 @@ CCharacter::CCharacter(CGameWorld *pWorld, CNetObj_PlayerInput LastInput) :
 
 void CCharacter::Reset()
 {
+	StopRecording();
 	Destroy();
 }
 
@@ -932,7 +933,7 @@ bool CCharacter::IncreaseArmor(int Amount)
 	return true;
 }
 
-void CCharacter::Die(int Killer, int Weapon, bool SendKillMsg)
+void CCharacter::StopRecording()
 {
 	if(Server()->IsRecording(m_pPlayer->GetCid()))
 	{
@@ -945,7 +946,11 @@ void CCharacter::Die(int Killer, int Weapon, bool SendKillMsg)
 
 		pData->m_RecordStopTick = -1;
 	}
+}
 
+void CCharacter::Die(int Killer, int Weapon, bool SendKillMsg)
+{
+	StopRecording();
 	int ModeSpecial = GameServer()->m_pController->OnCharacterDeath(this, GameServer()->m_apPlayers[Killer], Weapon);
 
 	char aBuf[256];

src/game/server/entities/character.h

@@ -194,6 +194,7 @@ public:
 	int Team();
 	bool CanCollide(int ClientId);
 	bool SameTeam(int ClientId);
+	void StopRecording();
 	bool m_NinjaJetpack;
 	int m_TeamBeforeSuper;
 	int m_FreezeTime;