remove outdated "button" project
using xml menu for context menu and implemented handlers to delete/edit recording
fixed ListView to properly refresh after a recording is deleted
improved EditRecordingActivity to actually load and save the data
added TimePickerDialogs and DatePickerDialogs to edit Recording
added check for consistency to setStart() and setEnd() of Recording
dynamically adjust recording's start/end time if the newly selected time is inconsistent (start after end)
fixed taskSelection dropdown to be displayed on first click
close Activity after saving Task