Add CurrentTimeEntryEditFragment stub.
Refactor MainPagerAdapter.

The page titles are easier to customize, fragments are only created
once, added current time entry edit fragment.
Add CurrentTimeEntryEditFragment layout.
Add draft time entry model concept.
Databind model to CurrentTimeEntryEditFragment.
Add ChangeTimeEntryDurationDialog.
Set WindowSoftInputMode.
Make soft input work with description editing.
Add billing flag changing.
Prevent returning deleted drafts.
Add time entry discarding.
Fix null ref exception on missing project.
New duration change behaviour.
Add draft editing support.
Use local time for date times.
Add date change dialog fragment.
Update test logic.
Truncate start time for accurate comparison.
Fix automagic stop time adjustment.
Return 0 duration when no start time.