0.1.5: No more save button trust issues

A few big changes in this update:

• You can now delete tasks!
• Creating a new task now automatically opens the task editor
• The program shows the last time you saved/loaded/created.
• Editor and viewer close when you load a different save (to avoid possible cross-interaction attempts which would likely result in issues)
• Task menu switches to viewer when switching tasks
• Task names don't expand beyond menu size
• Task data should update automatically as you edit it