Misc cleanups
Shakeout of AbstractHelper
Redesign of Permission helper
Clean up session helper
Add Krumo support to Xmf\Debug
Add XMF native wrapper for YAML support

Class includes static methods for conversion to and from YAML for
both strings and files.
 
YAML support package changed to mustangostang/spyc package
Remove Tables class, replaced with Migrate class
Move Cache, Permission and Session helpers up to Module

These are Module specific, but no longer helpers to Module/Helper.
Cleanup of comments, remove some side effects

get rid of XMF_EXEC or die
change defines to static constants
Replace with a working highlighter with static invocation
Remove experimental xoops autoload
Still a work in progress