Updated grab modifier handling
Normally we would just add grabs with chains like grab "A-b", "urxvt" to get something that responds to a press of Alt-b. The drawback of this is that we need many different modifiers like using control, super etc. and we are probably limiting or even disturbing other programs and allows the usage of easier binds.
grab "C-y", :SubtleEscape grab "Return", "urxvt" grab "n", :ViewNext grab "b", :ViewPrev
This is and per default commented out, the docs of the wiki and the default config have been updated accordingly.