fixed desugaring of enums
replace irModuleTrace field from ClaferEnv with a getter which always computes a fresh map
fixed ID lookup in Html generator
updated regressions after fixing desugaring of enums and ID lookup in Html generator
added uidIClaferMap to create a map from UID to IClafer
updated with gsdlab/develop: added uidIClaferMap

irModuleTrace is always recomputed
fixes in Desugarer and Html generator