Implement basic race handling

src/PlayerManager.cpp

@@ -11,6 +11,7 @@
 #include "Database.hpp"
 #include "BuddyManager.hpp"
 #include "MobManager.hpp"
+#include "RacingManager.hpp"
 
 #include "settings.hpp"
 
@@ -71,6 +72,9 @@ void PlayerManager::removePlayer(CNSocket* key) {
     // remove player's bullets
     MobManager::Bullets.erase(plr->iID);
 
+    // remove player's ongoing race, if it exists
+    RacingManager::EPRaces.erase(key);
+
     // save player to DB
     Database::updatePlayer(plr);