Implement fake multiplayer flag (#52)

`SPAWN.INI->[Settings]->ForceMultiplayer=false  ; bool`

Author: Metadorius

src/Spawner/Spawner.Config.cpp

@@ -83,6 +83,7 @@ void SpawnerConfig::LoadFromINIFile(CCINIClass* pINI)
 		MaxAhead         = pINI->ReadInteger(pSettingsSection, "MaxAhead", MaxAhead);
 		PreCalcMaxAhead  = pINI->ReadInteger(pSettingsSection, "PreCalcMaxAhead", PreCalcMaxAhead);
 		MaxLatencyLevel  = (byte)pINI->ReadInteger(pSettingsSection, "MaxLatencyLevel", (int)MaxLatencyLevel);
+		ForceMultiplayer = pINI->ReadBool(pSettingsSection, "ForceMultiplayer", ForceMultiplayer);
 	}
 
 	{ // Tunnel Options

src/Spawner/Spawner.Config.h

@@ -121,6 +121,7 @@ class SpawnerConfig
 	int MaxAhead;
 	int PreCalcMaxAhead;
 	byte MaxLatencyLevel;
+	bool ForceMultiplayer;
 
 	// Tunnel Options
 	int  TunnelId;
@@ -192,6 +193,7 @@ class SpawnerConfig
 		, MaxAhead { -1 }
 		, PreCalcMaxAhead { 0 }
 		, MaxLatencyLevel { 0xFF }
+		, ForceMultiplayer { false }
 
 		// Tunnel Options
 		, TunnelId { 0 }

src/Spawner/Spawner.cpp

@@ -291,7 +291,7 @@ bool Spawner::StartScenario(const char* pScenarioName)
 	{ // Set SessionType
 		if (Spawner::Config->IsCampaign)
 			pSession->GameMode = GameMode::Campaign;
-		else if (Game::PlayerCount > 1)
+		else if (Game::PlayerCount > 1 || Spawner::Config->ForceMultiplayer)
 			pSession->GameMode = GameMode::Internet; // HACK: will be set to LAN later
 		else
 			pSession->GameMode = GameMode::Skirmish;