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Update README.md

Adding missing prerequisites. These are probably installed if you build ghc often or use shake, but if not, these are missing.

Consolidate box pretty-printing

Add an explicit dependency on pkgDataFile to make sure GhcCabal hscolour is run after GhcCabal configure.

Shake `master` branch exports a symbol called `parallel` which overlaps
with ours.

Fix fallout from previous refactoring

This previously used `fromJust`, which bottomed due to the recent
`isLibrary` change.

Miscellany

Previously a very fragile heuristic was used. Now we explicitly declare
this.

Perhaps a better option in the future would be to instead emit this
information from `ghc-cabal` and pick it up from `package-data.mk`.

Fixes #9.

Also add (currently broken) Unicode support although this is broken by
Shake, the console output interface of which is badly broken (see
Shake #364)

HsColour also depends upon the sources existing. Fixes #6.