zshrc: add a function silent and use it.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
zshrc: invoke xmodmap.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
zshrc: prevent unwanted output.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Merge branch 'master' into work