Previously, the password could only be revealed -- once revealed it
could not be obfuscated anymore.
Now the obfuscated/deobfuscated state can be toggled by hitting the
corresponding keymapping repeatedly (default Alt+s in entry menu).
Moved all invocations of gopass to pass. Changed the inner workings of a
few functions to cope with the fewer utility functions in pass instead
of go (no auto-clipping, no flat item listing).
Perhaps still somewhat brittle but should overall have feature parity to
older rofi-gopass script.
