To-do list fix and minor Study Plan improvements

There was a bug in the latest update where the to-do tasks would stop writing out on a new playthrough, so I fixed it.

I also added a list of active goals at the bottom-left of the Study Plan to show which goals are currently being displayed in the Drawing app. When you click on the name of a goal, you also get a window explaining that you can check/uncheck the completed status of a goal to hide/reactivate it.

Additionally, a list of gained interests shows which requirements you already completed so far.