Fix some compilation warnings

Author: Kaffeine

src/engine/shared/netban.h

@@ -75,11 +75,8 @@ class CNetBan
 
 	struct CBanInfo
 	{
-		enum
-		{
-			EXPIRES_NEVER = -1,
-			REASON_LENGTH = 64,
-		};
+		static constexpr int EXPIRES_NEVER = -1;
+		static constexpr std::size_t REASON_LENGTH = 64;
 		int m_Expires;
 		char m_aReason[REASON_LENGTH];
 	};

src/game/server/gamecontext.cpp

@@ -1,7 +1,5 @@
 /* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
 /* If you are missing that file, acquire a complete release at teeworlds.com.				*/
-#include <new>
-
 #include <base/logger.h>
 #include <base/math.h>
 #include <engine/shared/config.h>
@@ -16,7 +14,6 @@
 #include <game/version.h>
 #include <game/collision.h>
 #include <game/gamecore.h>
-#include <iostream>
 #include <algorithm>
 
 #include <game/server/entities/character.h>
@@ -1792,7 +1789,6 @@ void CGameContext::OnClientEnter(int ClientId)
 
 	Server()->ExpireServerInfo();
 
-	CPlayer *pNewPlayer = m_apPlayers[ClientId];
 	mem_zero(&m_aLastPlayerInput[ClientId], sizeof(m_aLastPlayerInput[ClientId]));
 	m_aPlayerHasInput[ClientId] = false;
 }
@@ -3794,7 +3790,6 @@ void CGameContext::PrivateMessage(const char* pStr, int ClientId, bool TeamChat)
 	Msg.m_Team = (TeamChat ? 1 : 0);
 	Msg.m_ClientId = ClientId;
 
-	int NumPlayerFound = 0;
 	for(int i=0; i<MAX_CLIENTS; i++)
 	{
 		if(m_apPlayers[i] && !CGameContext::m_ClientMuted[i][ClientId])
@@ -3853,8 +3848,6 @@ void CGameContext::PrivateMessage(const char* pStr, int ClientId, bool TeamChat)
 			Msg.m_pMessage = FinalMessage.buffer();
 
 			Server()->SendPackMsg(&Msg, MSGFLAG_VITAL, i);
-				
-			NumPlayerFound++;
 		}
 	}
 }

src/game/server/infclass/entities/infccharacter.cpp

@@ -213,7 +213,6 @@ void CInfClassCharacter::Tick()
 		return;
 	}
 
-	const vec2 PrevPos = m_Core.m_Pos;
 	const int CurrentTick = Server()->Tick();
 	GameController()->HandleCharacterTiles(this);
 

src/game/server/infclass/events-director.cpp

@@ -9,8 +9,6 @@
 
 #include <vector>
 
-static const char WinterSuffix[] = "_winter";
-
 enum class EventType
 {
 	None,
@@ -19,7 +17,6 @@ enum class EventType
 };
 
 static EventType PreloadedMapEventType = EventType::None;
-static char aEventId[32] = {0};
 
 const char *EventsDirector::GetMapConverterId(const char *pConverterId)
 {