mac: only enable use mmove hook when a mouse button is actually pressed

[lunixbochs]

The MMOVE tap/hook here causes Talon to waste CPU when the user moves their mouse without buttons pressed: https://github.com/knausj85/knausj_talon/blob/main/code/mouse.py#L387-L400

You can probably get away with leaving it unregistered by default, and only register it between the drag and release commands.

[nriley]

I was able to comment out this tap usage entirely and dragging seemed to still work with an eye tracker. I was able to drag both with the left mouse button and with the right mouse button (mostly doesn't do anything different but it does in Excel), using 'drag'/'end drag' and 'right drag'/'end drag'.

@knausj85, looks like this was your change (e31ac72). Any idea what problem it was trying to fix, and if this is still a problem?

[knausj85]

This was to fix dragging windows so the window moved with the cursor. I don't believe it does anything on Big Sur or later though.

[nriley]

OK, think we can just remove it then, or would it make sense to make it conditional on macOS version? I don't have a 10.15 Mac any more.

[knausj85]

#1093 addressed this by removing the tap code