- lots of cleanups and structure/ui improvements:
 * unified transforms & measures ui : they now both
have an "activeTool" attribute to select tools
more easilly
 * toggling between tools is now working correctly:
fixes #44
 * improved internal tool toggling in transforms-ui
 * removed a lot of obsolete code
 * removed unused properties

- experimented with annotations persistance via localstorage
(wip, unlikely to be kept)
- regenated embeded version