Test WeakIdHashMap.
Remove unused code.
Remove debugging.
Remove unused code.
Test case to ensure WeakIdHashMap actually compares by id.
New MemoizeById class.
New memoizeById method.
Remove unused code.
Test property for map method.
Rename mapMemoizedById to memoizedMap.
New test property.
memoizedMap applies mapping function fewer times than expected.  Why?
Move VarTreeSeq to org.livefx.old package.
Remove old classes.
Remove old classes.
Remove old code.
Remove old code.
Drop all collections-based code.
New package.
Rename LiveValue to Live.