Move configured providers getter to LeapSettings.
Remove key for a provider with no enabled services
Preferences: select enabled services for providers
Add changelog. Closes #3534.
Merge remote-tracking branch 'ivan/feature/preferences-select-services' into develop
Move configured providers getter to LeapSettings.
Remove key for a provider with no enabled services
Preferences: select enabled services for providers
Refactor services display names out. Closes #3578.
Add changelog. Closes #3534.
Merge remote-tracking branch 'ivan/feature/preferences-select-services' into develop

Conflicts:
	src/leap/bitmask/gui/mainwindow.py
	src/leap/bitmask/gui/preferenceswindow.py