And make it saner by not having one global password that has to be set before encrypting/decrypting, which is as racy and poorly designed as it gets
Fixes#1917 's immediate symtoms, which some potential for other regressions due to the mess that is encrypted persistence currently
We now use a binary serialized format to save space and allow clean encryption of the user settings.
All the settings can (and should) be edited from the GUI so there is no loss of functionnality.
It can still read the old .ini format, and will seamlessly upgrade to the new format.
Fixes#1810
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