Added MaxClients public var to replace GetMaxClients (bug 3283, r=pred).

This is a hard bump of the plugin version number.  1.1 plugins compiled against this include set
will not run against earlier versions of SourceMod.

plugins/include/clients.inc

@@ -45,9 +45,19 @@ enum NetFlow
 	NetFlow_Both,			/**< Both values added together */
 };
 
-#define MAXPLAYERS		64	/**< Maximum number of players that can be in server */
+/**
+ * MAXPLAYERS is not the same as MaxClients.
+ * MAXPLAYERS is a hardcoded value as an upper limit.  MaxClients changes based on the server.
+ *
+ * Both GetMaxClients() and MaxClients are only available once the map is loaded, and should 
+ * not be used in OnPluginStart().
+ */
+
+#define MAXPLAYERS		64	/**< Maximum number of players SourceMod supports */
 #define MAX_NAME_LENGTH 32	/**< Maximum buffer required to store a client name */
 
+public const MaxClients;	/**< Maximum number of players the server supports (dynamic) */
+
 /**
  * Called on client connection.
  *
@@ -169,10 +179,16 @@ forward OnClientPostAdminFilter(client);
 forward OnClientPostAdminCheck(client);
 
 /**
+ * This function will be deprecated in a future release.  Use the MaxClients variable instead.
+ *
  * Returns the maximum number of clients allowed on the server.  This may 
  * return 0 if called before OnMapStart(), and thus should not be called 
  * in OnPluginStart().  
  *
+ * You should not globally cache the value to GetMaxClients() because it can change from 
+ * SourceTV or TF2's arena mode.  Use the "MaxClients" dynamic variable documented at the 
+ * top of this file.
+ *
  * @return				Maximum number of clients allowed.
  */
 native GetMaxClients();

plugins/include/core.inc

@@ -37,7 +37,9 @@
 
 #include <version>
 
-#define SOURCEMOD_PLUGINAPI_VERSION		3
+/** If this gets changed, you need to update Core's check. */
+#define SOURCEMOD_PLUGINAPI_VERSION		4
+
 struct PlVers
 {
 	version,
@@ -136,6 +138,25 @@ struct SharedPlugin
 public Float:NULL_VECTOR[3];		/**< Pass this into certain functions to act as a C++ NULL */
 public const String:NULL_STRING[1];	/**< pass this into certain functions to act as a C++ NULL */
 
+/**
+ * Horrible compatibility shim.
+ */
+public Extension:__ext_core = 
+{
+	name = "Core",
+	file = "core",
+	autoload = 0,
+	required = 0,
+};
+
+native VerifyCoreVersion();
+
+public __ext_core_SetNTVOptional()
+{
+	VerifyCoreVersion();
+}
+
+
 #define AUTOLOAD_EXTENSIONS
 #define REQUIRE_EXTENSIONS
 #define REQUIRE_PLUGIN