for new "scripts pic..." feature on the scripting area's context menu.
Also pushed up version dates for new beta release, and added
SnapManual.pdf to the help folder
* new entry in the ScriptsMorph's userMenu lets you export a picture of
all scripts, including comments.
* place sticky comments on World layer on dragging their anchor block,
fixes both #8 and #18
* additional settings for developing the backend
* the Block Editor now allows anchored comments,
* duplicating a block / script / sprite now also duplicates anchored
comments,
* deleting a block / script now also deletes anchored comments
When dragging blocks out of a running script, adding blocks into a
running script, or editing inputs of a running script, the script's
highlight should now adjust accordingly
Shift-clicking on the settings menu lets you specify a fraction, by
which blocks and scripts are scaled, allowing you to e.g. export
poster-sized hi-res script pics, or to present Snap! live on hi-res
screens and projectors