Added autotests for QzTools helper functions.
[Code] Renamed AutoFillModel + new class PageFormCompleter.
[Tests] Add tests for PageFormCompleter.

Also updated copyright on other tests.
Improved PopupWindow + added correspoding tests.

Added menu to popup windows. It is now also possible
to search on page in popup window (Ctrl+F).
Added Inspect Element action into popup window's context menu.
Final fix for page background with dark themes.

Background of html element is now by default set to
white.
Closes #602
Fixed crash when showing context menu in websearchbar.
Fixed setting current tab after recovering crash.

It set currentIndex - 1 before.
New option "Open new empty tabs after active tab".

Closes #544
PageFormCompleter: Improved detecting sent form.

Also added new test.
Possible to open background/selected tab from "Open in new tab" action

Inverts the prefered option to opening new tabs with middle mouse click.
Closes #635
Don't show "Resend form" dialog when app is starting.
Don't steal Ctrl+U/B/I shortcuts from page.

When writing eg. mail on gmail, you can make text bold,
underline and italic with Ctrl+U/B/I shortcuts.
It will now correctly process the web action instead
of showing bookmarks sidebar, source of page and page info.

Shortcut for bookmarks sidebar has been change to Ctrl+Shift+B