Most of the highlighting is moved to the plugin

HighLightPlugin
	- make plugin responsible for initial highlighting
	- implement stripping & highlightcall onInput instead of letting
	  Editor do that
MinimalPlugin
	- remove commented code
	- call reformat() when we updated content
LRTEditor
	- remove stripHtml
	- replace reformat with triggered InputEvent that can be handled
	  by highlightPlugin
	- newline is now contained in <span>; fixes some newline issues