fixes #779 by removing block prefs
Merge pull request #836 from waterbearlang/779_remove_showhide

fixes #779 by removing block prefs
adding some docs
add hint field
refactoring layout to use calc() vs. flexbox
big freaking long-overdue classname refactoring
fixed codemap and some more renaming
better presentation in scratch space
clean up whitespace
moving to class-based layout responsiveness
layout fixin'
finished cleanup of new layout
don't call scrollIntoView in scratchpad
disabling code map for now
turning off codemap for now
always handle mobile buttons, just in case
fixed double-drag from scratchpad