New lua function CHARMAN:GetCharacterCount.

How the Characters mod won't display by default if
there are no characters to play with at all.

src/CharacterManager.cpp

@@ -152,6 +152,13 @@ public:
 		LuaHelpers::CreateTableFromArray(vChars, L);
 		return 1;
 	}
+	static int GetCharacterCount(T* p, lua_State *L)
+	{
+		vector<Character*> chars;
+		p->GetCharacters(chars);
+		lua_pushnumber(L, chars.size());
+		return 1;
+	}
 
 	LunaCharacterManager()
 	{
@@ -159,6 +166,7 @@ public:
 		// sm-ssc adds:
 		ADD_METHOD( GetRandomCharacter );
 		ADD_METHOD( GetAllCharacters );
+		ADD_METHOD( GetCharacterCount );
 	}
 };