* Fix#5025 - Change edit entry widget title separator to the common bullet character • (U+2022)
* Fix#5307 and Fix#5347 - Remove transparent toolbar/window on macOS and properly color text in toolbar.
The light and dark theme don't respond to Windows's high contrast
accessibility mode, so when the theme is set to "auto", we
default to "classic" instead of "light".
Fixes#5044
Transforms application into a UIElement agent app when
minimize to tray is enabled and the window is hidden.
This hides the dock icon and removes the application
from the Cmd+Tab listing. The changes work well together
with macOS's inbuilt hide feature.
Also fixes the buggy tray icon context menu trigger behaviour.
macOS triggers the tray context menu also on normal left
click, which causes the window to toggle at the same time
as the menu. To fix this, window toggling has been disabled
altogether on macOS and users will be shown only the context
menu from now on.
Fixes#1334
Moves MacUtils into a separate sub folder and adds
WinUtils, NixUtils, and OSUtils for platform-native
code on Windows, Unix-like, and generic/all systems.
