Rewrote help.lua and added markup support to several plugins.

help.lua has been rewritten to support "/help command".
New variable "command" has been added to plugins for the syntax (w/out slash) to be displayed in main
help message. "doc" will be displayed upon "/help command".

Output of >12 plugins has been reformated to utilize markup.
There is a fairly standard style throughout plugins.

get_word() in utilities.lua now has defaults for nil arguments.

utilities.lua

@@ -3,6 +3,9 @@
 
 function get_word(s, i) -- get the indexed word in a string
 
+	s = s or ''
+	i = i or 1
+
 	local t = {}
 	for w in s:gmatch('%g+') do
 		table.insert(t, w)