ColoredRectangle with HasEvents should register for WindowOver

[vchelaru]

Currently it doesn't causing confusion. Either

• Let it register as WindowOver
  --or--
• Remove this variable from Gum for ColoredRectangle

This should probably be tested for other standards like Sprite and NineSlice too

[vchelaru]

It turns out that Standards only appear as WindowOver if they have any events assigned. I have extended the events checked to include all possible events rather than just Click and Push, and have documented the details here:

https://docs.flatredball.com/gum/code/gum-code-reference/cursor#windowover