The immediate action option clears (or not) the position of the events.
We use this to determine if the command should start at the given
position or merely activate the tool. This was being checked in the
menu options, which only activated for tool commands in the context
menu. Moving to the process event, we catch hotkeys as well.
This also restores the previous logic in eeschema that used a static
variable for storing wires rather than the private class variable.
Starting the draw event now picks up from the existing wires when
activated in immediate mode.
Fixes#3891 | https://gitlab.com/kicad/code/kicad/issues/3891