Add hint about the duration of key generation.

[Closes #3958]
Remember setup provider checks.

Also, on finish:
- hide checks groupBox
- clear domain lineEdit

[Closes #3815]
Remember provider CA checks.

[Closes #3814]
Add changes file for #3814 and #3815.
Merge remote-tracking branch 'ivan/bug/remember-checks-in-wizard' into develop
Merge remote-tracking branch 'ivan/feature/3958_add-hint-about-duration-of-key-generation' into develop
Use module attributes to store services strings.
Use display service name instead of hardcode it.
Use custom systray that ease the tooltip use.

- Create a custom SysTray that allows us to set services tooltips
independently.
- Initialize tooltip with service name at start.
- Update required service status on tooltip update.

[Closes #3998]
Use service's module strings instead of locals.
Merge remote-tracking branch 'ivan/bug/3998_shared-systray-tooltip' into develop
Check if we have a systray to use.

This fixes a failure when we run the first run wizard and don't have a
systray ready.
Merge remote-tracking branch 'ivan/bug/fix-systray-bug-in-first-run' into develop
Fix call to smtp gateway.
Show a more generic message to the user.
Merge remote-tracking branch 'drebs/change-smtp-relay-to-gateway' into develop
Merge remote-tracking branch 'ivan/feature/4200_change-key-generation-time-mesagge' into develop
Make all by default.
Merge remote-tracking branch 'ivan/bug/correct-make-quickstart' into develop
Send user's key to nickserver whenever the keymanager is initialized.