Update QuickJournal

[papafe]

Updated QuickJournal example to use it as a base for the sync version

• Added theme, icon and splash screen
• Added stylecop
• Updated packages (including Realm)
• Simplified pages and viewmodels name (no need to repeat "Journal" all the time)
• Removed unused fonts, images
• Enabled nullability
• Verified it still works on iOS, Android and Mac as before. Still black splash screen issue on iOS though
• Removed tizen

If we want to make any modifications to how the app works/features, this is a good time 😁

I think it's simple enough to provide a good example. The only part that I don't like very much is the use of the Messaging because of the bug in MAUI (that has been solved in version 8, coming out in November). This is used in EntriesViewModel to delete an entry if the user deleted both the title and the body. We could remove this functionality to simplify this example.

[coveralls]

Pull Request Test Coverage Report for Build 5736736559

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.06%) to 82.68%

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Files with Coverage Reduction	New Missed Lines	%
Realm/Realm/Exceptions/RealmException.cs	2	78.95%
Realm/Realm/Handles/SessionHandle.cs	3	84.72%

Totals
Change from base Build 5686656271:	-0.06%
Covered Lines:	6203
Relevant Lines:	7364

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💛 - Coveralls