Remove un-mac like behavior for the tray icon

Clicking on the menu bar icon should never actuall do anything to the
app. Is should only show the menu. I’m sure this is in the HIG
somewhere.
Tray icon changes, updated to current berkeley db, 1.4.a2 shibe

 * Tray icon on Mac is now off by default
 * Menu item in Settings for showing or hiding the tray icon (non
persistent pref)
 * Updated the Tray Menu show / hide item to change it’s text as
appropriate.
 * Moved the info.plist to the mac-specific subdir
 * Created a new monochrome tray icon
 * update the tray icon to invert it’s colors on the mac when the menu
is showing
 * Q_WS_MAC is not defined, ever, in qt5, so remove it as we run across
it.