Make dwell clicking indicators clearer

[1j01]

1. It should be visually obvious whether a click takes place or not.
   I could animate canceling a dwell click, with a blur, maybe shape it like an X.
   And I could flash a circle outline or target symbol when it actually clicks. Maybe an MLG hitmarker.
   I should make sure not to show a click indicator for a drag release. Maybe show an octagon outline or an open hand (letting go / saying stop, but not facing the user, because it's meant to be analogous to the user.)

2. It should be visually obvious whether a dwell will click or release from a drag.
   I show a stop sign (octagon) when releasing from a drag, but it's the same color as the normal indicator (red), and at a glance, an octagon is not that different from a circle!
   I could change the normal indicator color.

3. (I also hope to improve the visibility of the indicators generally.)