Set WM_CLASSNAME

[nPHYN1T3]

Is your feature request related to a problem? Please describe.
Can't launch with class name to differentiate instances.

Describe the solution you'd like
I'd like something like -c --class so you can launch with identifiers for easier wmctrl manipulation.
terminator -l left -c "left" &
terminator -l right -c "right" &
DISPLAY=:0.1 wmctrl -ir $(DISPLAY=:0.1 wmctrl -lx | grep -i "terminator.right" | awk '{print $1}') -e 0,3840,0,1280,1080
DISPLAY=:0.1 wmctrl -ir $(DISPLAY=:0.1 wmctrl -lx | grep -i "terminator.left" | awk '{print $1}') -e 0,0,0,1920,1080

Describe alternatives you've considered
I tried xprop? heh

Additional context
Add any other context or screenshots about the feature request here.
I suppose you can cheese it with the -T option?