initial work on stacking expressions
tweak alighnment and begin supporting blocks that overflow
updated javascript language to convert trailing name-only sockets to be suffixes, removed unneeded value=nulls, converted number values to be numbers rather than strings, converted boolean values to be booleans rather than strings
Merge branch '454_stackable_expressions' of https://github.com/waterbearlang/waterbear into test_layout
fix overflow in desktop mode