renaming ZUSE.GUI to ZUTOOLS in order to make it an own library
splitting inits
moving WebGLErrorMessage from ZUTOOLS to ZUSE; moving tab initialisation to InitZutools
independent Utils for zutools
updated readme
preparing to support multiple languages
loading language xml
loading tabs content from xml
setting title and status text from xml, independent of their initialisation
Languages is own object in zutools
preparing for tooltip translation
loading tooltips from xml
preparing popup functionality
replacing old tooltips
added PopupTimer
tooltip can only be entered when there are inputs in it
renaming Popup to Tooltip
added content div inside tooltip to allow inputs without interfering with tooltip mouseevents
renaming TooltipTimer to TooltipManager; Slider and Button stub
added ZUTOOLS.Selection; preparing for languages tool