Version 1.8.0 released

- Wysiwyg Quotes
*The quote mode can be toggled just pressing the button (useful to get
out the quotes)
*Modal window to access its properties
- Html source button (only in debug mode)
- Plugins management have been rewritten:
*Several modifications inside main plugin
*All plugins (except the main one) list can be accessed with the existed
listener
*The main plugin is now loaded at first (which give an access to its
functions to any other plugins, see the new xenquote plugin as an
example) but will be activated at the very last