Use a central timeout controller (in LobbyProtocol) to be used by

both client and server. Voting time now starts from the moment the
kart screen is shown (not on first player having finished voting).
Improved coding style.

src/network/protocols/lobby_protocol.cpp

@@ -30,6 +30,7 @@
 #include "network/race_event_manager.hpp"
 #include "race/race_manager.hpp"
 #include "states_screens/state_manager.hpp"
+#include "utils/time.hpp"
 
 std::weak_ptr<LobbyProtocol> LobbyProtocol::m_lobby;
 
@@ -37,6 +38,7 @@ LobbyProtocol::LobbyProtocol(CallbackObject* callback_object)
                  : Protocol(PROTOCOL_LOBBY_ROOM, callback_object)
 {
     m_game_setup = new GameSetup();
+    m_end_voting_period.store(0);
 }   // LobbyProtocol
 
 // ----------------------------------------------------------------------------
@@ -140,3 +142,29 @@ void LobbyProtocol::setup()
 {
     m_game_setup->reset();
 }   // setupNewGame
+
+//-----------------------------------------------------------------------------
+/** Starts the voting period time with the specified maximum time.
+ *  \param max_time Maximum voting time in seconds
+ */
+void LobbyProtocol::startVotingPeriod(float max_time)
+{
+    m_max_voting_time = uint64_t(max_time*1000);
+    m_end_voting_period.store(StkTime::getRealTimeMs() + m_max_voting_time);
+}   // startVotingPeriod
+
+//-----------------------------------------------------------------------------
+/** Returns the remaining voting time in seconds. */
+int LobbyProtocol::getRemainingVotingTime()
+{
+    uint64_t t = m_end_voting_period.load()- StkTime::getRealTimeMs();
+    return int(t/1000);
+}   // getRemainingVotingTime
+
+//-----------------------------------------------------------------------------
+/** Returns if the voting period is over. */
+bool LobbyProtocol::isVotingOver()
+{
+    return m_end_voting_period.load() < StkTime::getRealTimeMs();
+}   // isVotingOver
+