feat(plugins): add aliases cheatsheet plugin (#4662)

* add: explore alias quickly with aliases plugin.

* change: add compatibility with python2 & python3.

- add compatibility.
- add termcolor.py.
- remove aliass(search), just use acs.
- detect python.

plugins/aliases/aliases.plugin.zsh

@@ -0,0 +1,10 @@
+# with lots of 3rd-party amazing aliases installed, just need something to explore it quickly.
+#
+# - acs: alias cheatsheet
+#   group alias by command, pass addition argv to grep.
+ALIASES_PLUGIN_ROOT=$(cd `dirname $0` && pwd)
+function acs(){
+    which python >>/dev/null
+    [[ $? -eq 1 ]] && echo "[error]no python executable detected!" && return
+    alias | python $ALIASES_PLUGIN_ROOT/cheatsheet.py $@
+}