Fix enum namespaces for the nightly build from 17.11
Parser - independent enum for Lit and tokenise suffixes on literals
Fix namespaced enums fallout
chario: Fix type mismatch
More namespaced enum fallout
platform_tree: Export enum constructors

This is the least invasive way forward at the moment
libsyntax fallout
platformtree: Nightly fallout
platformtree: HashMap::find renamed to get