Add a favorites sidebar and all persistant sidebar

[SNoiraud]

We have many possible views and often use a small set of these.

The current PR adds the possibility to display only the views we need.
It is also useful to reload the last navigation sidebar.

[giotodibondone]

Screenshots on Gramps 6.0

[Done] My only suggestion is to add a help button on the Choose your favorite view dialog to url: https://www.gramps-project.org/wiki/index.php/Gramps_6.0_Wiki_Manual_-_Main_Window#Switching_Navigator_modes

Thank you 👍

https://gramps.discourse.group/t/keyboard-shortcuts-not-valid/7898/16

[QuLogic]

Typo: it's 'persistent' (for both the PR title and commit message)

[giotodibondone]

@SNoiraud Add the help button to the view selection dialog 43d6bca

❤ Thank you for the Help button, but note that two help page tabs are being opened at the same time

• the correct page https://gramps-project.org/wiki/index.php?title=Gramps_6.0_Wiki_Manual_-_Main_Window#Switching_Navigator_modes
• and the index page https://gramps-project.org/wiki/index.php?title=Gramps_6.0_Wiki_Manual

[giotodibondone]

@SNoiraud We have two WIKI pages. We only need one. d93d220

Worked only one help page opens thank you 👍