* Simplify css for click animation
* Refactor to transfer responsibility for casting multiple synchronous to index.ts from machine.ts (so they can be dealt with in bulk)
* During synchronous application of a batch of events, move the mouse to the last position so that it's in the correct place when the timer starts
- previous `needCastInSyncMode` added in 4bf533a675 meant that the isSync versions of MouseMove/TouchMove were being accidentally ignored
- each synchronous MouseMove would have resulted in a separate mouse position update
- the Click/TouchStart/TouchEnd events didn't have an async version
* The desktop pointer cursor is not representative of what is happening on a mobile device.
Instead, check a recording for any presence of a Touch event, and switch to a touch visualisation mode for the entire recording.
(for now, we use this mode even for mixed touch/mouse devices - this could be improved upon in future)
Show a round circle representing the users' finger which is visible only between TouchStart and TouchEnd events
Again this can be evolved upon, but this change should be a good start in the right direction.
* It's more correct to not have a transition for repositioning of touch as user can lift finger off screen and place elsewhere; however we can now have much smoother touch movement during the .touch-active phase as we know the finger is on the screen. This has a .25s delaying effect on the touch position which IMO is acceptable; e.g. scroll position can lag behind a touch movement and this seems to bring them more in sync
* Ensure we end up with the correct touch-active state after a series of synchronous events
* Important to discontinue tail animations and position transitions when user has lifted their finger and placed it into a new position. This is apparent in a replay session where the user is scrolling the page using repeated TouchMove bottom-to-top movements
* Simplify by unwrapping `mouseState.touchActive` and `mouseState.pos` into their own global vars
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