Adds in homebrewed and tooltipable repeat block.
Merge pull request #217 from virtual-world-framework/new-repeat-block

Tooltipable repeat block
Add graphical tooltips to app defined blocks
Change tooltip removal to be on document mousemove
Add placeholder tooltip images and fix tooltip remove event listener
Add tooltips to new graph blocks
Remove dimensions from tooltip def and generate tooltip html content dynamically
Add placeholder tooltip for while block