ca-store now takes a --completion argument to output completions
to standard output. These are to be used for completion scripts,
in future commits.
Before the 1.0.0 release we need to either:
1) Work out how to get bash et al to accept these completions
without mangling them
2) Get optparse-applicative to handle the command parsing entirely
and forgo the Moore machine approach
All errors, warnings, and messages are now listed in a sum type
in 'CAStore.Type.Text'. The added structure should help with
writing better error messages. Also, if and when we get to
localising ca-store, implementation will be trivial.
ca-store is planned to work as follows:
1) A monad (currently IO) will generate the configuration, read the command
line, parse the config files, and create the environment the program
should run in.
2) This environment will be passed to the main monad (currently Program)
to do the work.
Currently everything will be directly coded with little to no abstraction.
Once ca-store is up and running, we will begin regaining purity by pulling
major features into small testable units.
