WoW:Sky (AddOn)

--[[
--	updateSlashCommand ( {slashCommandParts}, ... )
--
--		Updates a /command member if its valid.
--
--		e.g.
--			updateSlashCommand({id="myID";onExecute = fooFunc; } );
--
--			will change the onExecute function for myID.
--
--	arg members:
--		id - the ID matching the old slashCommand
--		member - onExecute | onSpace | onTab | commands | action | helpText
--		newvalue - the new value. 
--
--	returns:
--		true - successfully replace.
--		false - validation failed
--]]