refactor(core): Rename SILE's *other* command stack thingy
refactor(core): Rename SILE's *other* command stack thingy

alerque/sile,simoncozens/sile,alerque/sile,alerque/sile,simoncozens/sile,simoncozens/sile,alerque/sile,simoncozens/sile