wifi: Add search to Known Wi-Fi Networks dialog

The "Known Wi-Fi Networks" dialog is currently sorted by when it was last connected to. If there are many such networks, then finding a specific one becomes quite hard.

This change adds a search toggle button and a search bar to the dialog, to make finding specific known networks easier. The search bar can be toggled, by pressing the search toggle button.

The rows of the dialog are made (in)visible depending on whether the title of the row matches the search string.

Closes #1949

Edited by Hendrik Müller

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