Important feature change

Edit timer is now always enabled. Instead of enabling/disabling this option, you now edit the timer by double-clicking the time field.

Other new features/improvement

StopWatch now only runs single instance - it detects at startup if another instance is running, and brings it into focus.
New icon that is visible on dark Windows 10 taskbar theme.
Timers now also support days - eg. 2d 13h 34m

After version 1.6.1 the Jira session might timeout. If this happens, StopWatch will now automatically re-authenticate and retry the requests.
When you activate many timers, the StopWatch window might be too big for the screen. Now the window will not be higher than desktop size, and instead a scrollbar gives access to the remaining issues.
Minimize to tray sometimes did not show the system tray icon.
Dropdown box with issue list only updated the description below when leaving the field. Now it happens on selection + on if you manually write a key.
Requests to Jira API did not work, if the issue key had leading spaces eg. " OPS-14". This has been fixed.