Generated package.yaml files from the old cabal files with hpack-convert,
removed some problematic blank lines manually,
regenerated the cabal files from the package.yaml files with hpack.
Tests pass, looks like all the info is still there.
This means that from now on, we don't edit cabal files directly.
We edit the less verbose package.yaml files. stack will update
the cabal files automatically (or non-stack users can use hpack).
The changes to both are committed, as we still want to provide
the cabal files to downloaders.
Make these modules' names more like the heavily-used types they
define (CliOpts, UIOpts, WebOpts). This is consistent with
RawOptions and ReportOptions, and helps with code navigation.
Here are hpack package.yaml files for the other hledger cabal files.
These remove a lot of human-error-prone duplication.
They are not used yet as hpack isn't quite mature enough -
when it supports flags and benchmarks we will probably switch.
