Fix #25070: support copy-paste in local time signatures

[Reedbeta]

Resolves: #25070

Support copy/paste in local time signatures, with the restriction that the source and destination ranges must all have the same time stretch ratio. Also enables features like "repeat selection", Alt+drag range copies, and explode which are built on copy/paste internally.

Tested:

• Tuplets
• Dynamics etc.
• Spanners/lines
• Multiple voices
• Multiple staves
• Explode/implode
• Paste double/half duration
• Working on the measure before a local time sig change
• The measure after a local time sig change
• The last measure

Some other minor changes in this PR:

• Adds a natvis file for the Visual Studio debugger with visualizers for a few common types such as Fraction.
• Fixes a handful of debug-only asserts that I ran into.
• Use the "forbidden" cursor (🚫) when Alt+dragging to a location that you can't drop in (either because of local time signatures or another reason).
• Setup time ticks properly for local time signatures (so Alt+drag will work).
• Show error dialogs for explode/implode and repeat-selection when we can't do it due to local time signatures.

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