Implement a new setting, `pinned.tab.frozen` (boolean), which when false
allows a user to navigate to new URLs in a pinned tab (default behavior
is to have `pinned.tab.frozen = true`, in which no navigation is allowed).
issue URL: https://github.com/qutebrowser/qutebrowser/issues/4400
Changes to be committed:
modified: qutebrowser/browser/browsertab.py
Add `navigation_blocked` method to AbstractTab, which returns
true if navigation is allowed on a tab.
modified: qutebrowser/browser/commands.py
Change `openurl` to use `navigation_blocked` method of a tab to
determine behavior while navigating a pinned tab.
modified: qutebrowser/components/misccommands.py
Change `home` to use `navigation_blocked` method of a tab to
determine behavior while navigating a pinned tab.
modified: qutebrowser/config/configdata.yml
Add `pinned.tab.frozen` config.
modified: tests/end2end/features/tabs.feature
Add tests for :open and :home on pinned tabs with
`pinned.tab.frozen` set to false
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