Optional toggle to display last status of nodes in debug tree for inactive nodes

[bitbrain]

For larger trees that execute a lot of actions in a short period, it is difficult to grasp sometimes what is actually being executed. To help that, we could add a toggle in the debug view that (toggled on by default) will display the last status of nodes that are currently inactive.

[lostptr]

I would let that ON as the default and make it toggleble.