#277 text info should have an auto update/reload/refresh option

[Ely Lizaire]

It would be great if yad had an option to automatically reload a file for text info dialogs. This option would be enable text-info to be used to read files that are being constantly updated such as active log files; the option could be called refresh use seconds as its interval i.e.:

yad --text-info --refresh 0.5 --file="$log"