This removes the ability to start nvim via the following aliases in
favor of just using their command line arguments:
ex vim -e
exim vim -E
view vim -R
gvim vim -g
gex vim -eg
gview vim -Rg
rvim vim -Z
rview vim -RZ
rgvim vim -gZ
rgview vim -RgZ
This also removes Vi mode (-v) for consistency. From ':help -v':
-v Start Ex in Vi mode. Only makes a difference when the
executable is called "ex" or "gvim". For gvim the GUI is not
started if possible.