extracted Concat.hs from Alloy generator
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
added parentIClaferMap
added ClaferBinding to IClaferId
updated with develop