Icon zoom transition issues

[GoogleFrog]

Icon zoom transition has issues that would need to be resolved before it is usable:

• Spring draws icons at a different location to the widget. This causes most icons to jitter upwards when you zoom out.
• Widget drawn icons are hard to click on. Spring drawn icons have larger hitvolumes than the units themselves. I expect to be able to click on units which are mostly (but not entirely) icons in the same way I can click on Spring icons. Currently my attempts at unit selection mostly miss.
• Small units are set to turn into icons before larger units. Planetwars structures tend to be very large and are set to not become icons for quite a while. Smooth icon transitions destroys this behaviour. This mostly matters for seeing small units.

[CrazyEddieTK]

"Smooth icon transitions destroys this behaviour." - This was intended, so that all units are represented identically at all times - either by icons, or by small-and-getting-smaller icons, or by no icons.

"This mostly matters for seeing small units." - Lowering the floor ("icontransitionbottom") addresses this; it ensures that an icon continues to be visible for all units until the camera is close enough to the ground to be able to clearly identify even the smallest units. The values I specified when I wrote the widget worked well for me on my display; the changed defaults have a floor that's too high. This is probably display-dependent and is also a matter of aesthetic preference.