* New default behavior: Preserves offsets when moving clips, resizes in fixed increments.
* Adds shift + drag: Snaps move start position (like current behavior) or end position (new),
based on which is closest to the real position. When moving a selection,
the grabbed clip snaps into position and the rest move relative to it.
* Adds alt + drag: Allows fine adjustment of a clip's position or size,
as an alternative to ctrl + drag.
* Adds a Q dropdown in the song editor to allow finer or coarser snapping (8 bars to 1/16th bar)
* Adds a proportional snap toggle. When enabled, snapping size/Q adjusts based on zoom,
and a label appears showing the current snap size. This is disabled by default.
1c715bc335