Add the singlechar plugin

plugins/singlechar/singlechar.plugin.zsh

+###########################
+# Settings 
+#
+# These can be overwritten any time.
+# If they are not set yet, they will be
+# overwritten with their default values
+
+default GREP grep
+default ROOT sudo
+
+###########################
+# Alias
+
+alias y='"$GREP" -i'
+alias n='"$GREP" -vi'
+
+alias x='xargs'
+alias xy='xargs "$GREP" -i'
+alias xn='xargs "$GREP" -iv'
+
+alias s='"$ROOT"'
+alias sx='"$ROOT" xargs'
+alias sxy='"$ROOT" xargs "$GREP" -i'
+alias sxn='"$ROOT" xargs "$GREP" -iv'
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