Add another page to options

All 32 available widgets on "Display" page were taken, this adds another
page, "Rendering", to the options window, so it can hold remaining widgets.

src/localisation/string_ids.h

@@ -2330,6 +2330,8 @@ enum {
 	STR_SCALING_QUALITY_ANISOTROPIC = 5732,
 	STR_USE_NN_AT_INTEGER_SCALE = 5733,
 
+	STR_OPTIONS_RENDERING_TIP = 5727,
+
 	// Have to include resource strings (from scenarios and objects) for the time being now that language is partially working
 	STR_COUNT = 32768
 };