Numerous small fixes in rendering and startup
- improved check on block tags in editmode
- fixed incorrect reference of simply-data-path in lists
- added cloning of objects in lists, so that no references to any databindings are passed
- when rendering fields as template, keep the data reference to the field parent (don't change the scope to the field data)
- improved databinding housekeeping and cleanup when document fragments are removed from the DOM
- improved pasting HTML in elements that only allow inline elements
- improved handling of lists (ol, ul) and list items
- improved handling of textarea's and inputs inside templates
- fixed loss of focus in Chrome when calculating the toolbar position
- fixed screen bouncing behaviour when rerendering lists