Update release 18d30

Mostly bug fixes, plus a version of the well known game 2048.

Add games inc 2048
Compiler error exception
Fix action on negated object; tests
Fix compile message
Fix expand rules for actions; rule translate tests
Unity: scale sprite/text
Fix UI to show bg for board
Fix expansion of OR objects in action
Fix expansion of ambiguous directions in action
Fix rule after loop is skipped
Fix Random object should create just one
Fix Empty pattern start should match everything
Use equality for comparing atom objects
Use OrdinalCase for object symbol table
Just one check for net change in level or movers
Refactor and find all matches before actioning them
Fix random prefix to pick one match not one rule
Update readme