Replace UiApp with HtmlService

[barrybecker4]

Saw this error when I last tried to use tutormatch.
UiApp has been deprecated. Please use HtmlService instead. (line 16, file "TutorMatchApp", project "LoganTutorMatchApp")

[barrybecker4]

See https://developers.google.com/apps-script/guides/web

[barrybecker4]

I ported everything to use the new HtmlService API. It was a lot of work because the approach is completely different. I suppose that now that the work is done, I can replace the TutorMatchApp directory with the contents of TutorMatchApp2