Add a crosshair size option

5 sizes are available (from 0 to 4), with 2 being the default vanilla-like
value.

Size 0 is a dot with alpha adjusted to match the crosshair color
settings.

port/src/main.c

@@ -171,5 +171,6 @@ PD_CONSTRUCTOR static void gameConfigInit(void)
 		configRegisterInt(strFmt("Game.Player%d.CrouchMode", i), &g_PlayerExtCfg[j].crouchmode, 0, CROUCHMODE_TOGGLE_ANALOG);
 		configRegisterInt(strFmt("Game.Player%d.ExtendedControls", i), &g_PlayerExtCfg[j].extcontrols, 0, 1);
 		configRegisterUInt(strFmt("Game.Player%d.CrosshairColour", i), &g_PlayerExtCfg[j].crosshaircolour, 0, 0xFFFFFFFF);
+		configRegisterUInt(strFmt("Game.Player%d.CrosshairSize", i), &g_PlayerExtCfg[j].crosshairsize, 0, 4);
 	}
 }

port/src/optionsmenu.c

@@ -945,6 +945,20 @@ static MenuItemHandlerResult menuhandlerCrosshairSway(s32 operation, struct menu
 	return 0;
 }
 
+static MenuItemHandlerResult menuhandlerCrosshairSize(s32 operation, struct menuitem *item, union handlerdata *data)
+{
+	switch (operation) {
+	case MENUOP_GETSLIDER:
+		data->slider.value = g_PlayerExtCfg[g_ExtMenuPlayer].crosshairsize;
+		break;
+	case MENUOP_SET:
+		g_PlayerExtCfg[g_ExtMenuPlayer].crosshairsize = data->slider.value;
+		break;
+	}
+
+	return 0;
+}
+
 static MenuItemHandlerResult menuhandlerCrosshair_R(s32 operation, struct menuitem* item, union handlerdata* data)
 {
 	switch (operation) {
@@ -1120,6 +1134,14 @@ struct menuitem g_ExtendedGameMenuItems[] = {
 		20,
 		menuhandlerCrosshairSway,
 	},
+	{
+		MENUITEMTYPE_SLIDER,
+		0,
+		MENUITEMFLAG_LITERAL_TEXT | MENUITEMFLAG_SLIDER_WIDE,
+		(uintptr_t)"Crosshair Size",
+		4,
+		menuhandlerCrosshairSize,
+	},
 	{
 		MENUITEMTYPE_SELECTABLE,
 		0,