Allow moving tracks and views up/down/to top/to bottom, and better click and drag track re-ordering

[cmdcolin]

this is supplementary to pinning track, I think there is still an opportunity to have these operations without track pinning

see screenshot, since it expands the number of menu items significantly the options are placed under a submenu sort of opaquely named "options"

[cmdcolin]

other options could include making these up/down options on the track label themselves

[cmdcolin]

fixes #4315

[cmdcolin]

small bonus: by avoiding getSnapshot in the "moveTrack" function (used for click and drag to re-order tracks in the lgv) it avoids the tracks having to re-render themselves

[carolinebridge]

Tested -- looks and feels good

I feel like "options" isn't the best word for this menu item. Google slides for example uses the word "Order" in their options for moving items to the front/back.

Probably best in another PR but I feel like the click+drag functionality should be updated to be more in line with how intuitive + fluid this feels.

[cmdcolin]

agree on the wording being tricky...order is good though!

[cmdcolin]

also interestingly, I think the "dimming" of the tracks does not work and was piling up the dimming at the top of the view instead of being dimmed at the right y-offset. removing the dimming may help

[cmdcolin]

i've removed the dimming to try to help with that situation for now