migrate newCpsName() to use goog.getUid() instead of global counter
migrate newAnonymousLambdaName() to use goog.getUid() instead of global counter
replace remaining uses of uniqueNodeCounter with goog.getUid().
Remove r5js.globals. No longer needed.
introduce r5js.DatumType, intended to replace string literal "types" in codebase
all: use r5js.DatumType instead of string literals where possible.
all: more conversions of raw strings to r5js.DatumType