Changes that I have made are as following:
- Changed ListViews with RecyclerView for better performance and to handle some relational tasks of two lists.
- Changed the Refresh with SwipeRefreshLayout because the old way was too bad coding practice.
- A few GUI changes like limiting the long text to be shown on screen and adding a favorite icon to support favorites.
- SingleStationActivity has now a separate api call to individually handle one station data in it. This saves us a lot of time to get data in PTSFragment (now we're only calling 2 departures not all of them). Secondly SwipeRefreshLayout has been implemented in this Activity too. To provide user to Refresh the data for a single station by staying on the SingleStationActivity.
- Removed a few commented code that was no longer needed.

New things that I have made in this new Feature are as following:
- Created a few classes like (PTSFavAdapter: for RecyclerView of Favorites, DepartureList: for handling a list of Departures in the SingleStationActivity and PTSInterface: this is a generic interface it can be used in future too for two type of functionality onItemRemoved and onItemAdded, it can be further expanded as per our will in future).
- Created a pts_fav_list_item.xml in res/layout to handle data on every row of favorites RecyclerView.
- Added a delete icon for deleting favorites from the list if they're not needed anymore

What have we achieved in this new Feature:
- First of all we have finally configured favorites as a feature inside the PTS Module.
- The layout is improved
- You can add or delete favorites very easily(For adding just click on stars in nearby List. While for deleting or to Un-favorite something just swipe to left or click on the yellow star to Un-favorite a station) and there is an undo functionality too.
- Less amount of data being called from server which saves us cost on memory and time.
- And frequent refreshing of data on every screen.