Increasing file format tag to "4.10"

[mike-spa]

This is necessary because both PR #17001 and PR #17237 introduce new items and properties which can't be read by older versions.

[Jojo-Schmitz]

Gives a chance to merge #12133 too.

@cbjeukendrup said to have a list of things to consider when changing the file format...
Edit: Ah, here it is: #15705

[igorkorsukov]

@mike-spa I think we should make new read implementation for format 4.1:

• Make copy of dir 400
• Rename to 410
• Rename namespace mu::engraving::rw400 to mu::engraving::rw410
• Rename class Read400 to Read410
• Add make reader in https://github.com/musescore/MuseScore/blob/master/src/engraving/rw/mscloader.cpp#L53
• And so on

After, at 410 we will start removing the old unnecessary code for supporting old formats (it will remain at 400 and below) and we will add new code that we want to change #15705