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Fixes #12

Fixes #4

Fixes #13 and related to #12

This commit makes it explicit when tabs model url is changing
url of the webview. Without such decoupling, it mobile google search
result was restored as a tab, clicking on search leads to change in url
and resets page back to its older state making it impossible
to a new enter search string

It should always be created using instance()

Creating it seems to take some time, so while it is not yet finished don't try to screenshot it.

* Allows to store isMobile again

Advantages:

* Model information is not duplicated between the qml part (QtQml.Models) and the browserManager::m_tabs
* Changes do not need to be synced with browser manager anymore
* properly testable (and test implemented)
* A lot less logic in the ui (qml part)
* No json inside the ini file

Drawbacks:
* isMobile is not saved to disk anymore to be able to use a simple ini list (doesn't matter much to me, please comment if it does to you, ideally with idea how to store it)

General Changed:
* BrowserManager is now a singleton with a static instance getter, to share one QSettings instance throughout Angelfish

 #This is the commit message #3:

Fixes one warning from QtWebEngine and probably improves performance

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"